Facial Canal Research Articles

Long-term facial nerve outcome in surgically treated petrous bone cholesteatoma patients.

The term petrous bone cholesteatoma (PBC) represents a slow-growing epidermal lesion arising from the petrous part of the temporal bone. It is a rare incidence accounting for only 4-9% of all petrous bone lesions. PBC represents a real surgical challenge due to its complex relationship with critical neurovascular structures. To demonstrate our experience in using various options of facial nerve (FN) management during surgical treatment of PBC and analyze the long-term facial function outcomes. Retrospective medical record review in a quaternary skull-base center. Medical records of 298 PBC cases operated between the years 1983 and 2024 were thoroughly evaluated. Sanna's classification scheme was used to classify cases into the appropriate class and the House-Brackmann (HB) grading system of the FN was used to assess the facial function pre- and postoperatively. A total of 298 PBC cases were surgically treated at our center. Males constitute 68% (n = 203) of total operated PBC patients while the rest 32% (95) were females, making the male-to-female ratio 2.2:1. The age in this series ranged from 9 to 85. According to updated Sanna's PBC classification, 44% were supralabyrinthine, 33% were massive, 9% were infralabyrinthine-apical, 8% were infralabyrinthine, and 5% were apical. On preoperative FN function examination, 45% (n = 133) of patients had various degrees of paresis and complete paralysis whereas 55% (n = 165) had normal FN function. The commonest degree of paresis observed was HB-III (18.5%) followed by HB-IV (5.7%). A total of 40(13.4%) patients, however, had complete facial paralysis at the initial presentation. The facial function was compromised more frequently in supralabyrinthine and massive PBCs. Among the total patients who had an abnormal facial function at presentation, 52% had paresis/paralysis for less than a year whereas 48% had FN paresis/paralysis for greater than one year. The most commonly used surgical approaches at our center were transotic (TO), modified transcochlear type A (MTCA) with rerouting of the FN, and translabyrinthine (TLAB) with external auditory canal (EAC) closure. Intraoperatively an intact fallopian canal was found only in 33% (n = 99) cases whereas the rest 67% (n = 199) had erosion of the fallopian canal either with intact (n = 24) or infiltrated FN (n = 175). The FN was maintained in the bony fallopian canal in 35% (n = 104) cases. An active form of FN management, however, was required in 65% (n = 194) of cases either intraoperatively or as a second-stage procedure. Factors affecting postoperative FN function include age, preoperative FN function (HB), duration of paralysis, class of PBC, surgical approach, and method of active FN management. PBCs represent diagnostically and surgically challenging lesions of temporal bone which are usually frustrating to the treating surgeon. Preoperative anatomic classification of the lesion enables the physician to choose the appropriate surgical approach. Sanna's classification is the most widely accepted system used to classify PBC. This classification is based on the relation of the lesion to the labyrinthine block. Active FN management, including rerouting, end-to-end anastomosis, cable nerve grafting, and masseteric-to-FN anastomosis routinely come into play in the surgical management of PBCs, and the postoperative FN results after such interventions can be satisfactory in most cases.

Comparative Anatomic Analysis of Neuronavigated Transmastoid-Infralabyrinthine Approaches for Jugular Fossa Pathologies: Short Anterior Rerouting Versus Nonrerouting and Tailored Nonrerouting Techniques.

Access to the jugular fossa pathologies (JFPs) via the transmastoid infralabyrinthine approach (TI-A) using the nonrerouting technique (removing the bone anterior and posterior to the facial nerve while leaving the nerve protected within the fallopian canal) or with the short-rerouting technique (rerouting the mastoid segment of the facial nerve anteriorly) has been described in previous studies. The objective of this study is to compare the access to Fisch class C lesions (JFPs extending or destroying the infralabyrinthine and apical compartment of the temporal bone with or without involving the carotid canal) between the nonrerouting and the short-rerouting techniques. Also, some tailored steps to the nonrerouting technique (NR-T) were outlined to enhance access to the jugular fossa (JF) as an alternative to the short-rerouting technique. Neuronavigated TI-A was performed using the nonrerouting, tailored nonrerouting, and short-rerouting techniques on both sides of 10 human head specimens. Exposed area, horizontal distance, surgical freedom, and horizontal angle were calculated using vector coordinates for nonrerouting and short-rerouting techniques. The short-rerouting technique had significantly higher values than the NR-T ( P < .01) for the exposed area (169.1 ± SD 11.5 mm 2 vs 151.0 ± SD 12.4 mm 2 ), horizontal distance (15.9 ± SD 0.6 mm vs 10.6 ± SD 0.5 mm 2 ), surgical freedom (19 650.2 ± SD 722.5 mm 2 vs 17 233.8 ± SD 631.7 mm 2 ), and horizontal angle (75.2 ± SD 5.1° vs 61.7 ± SD 4.6°). However, adding some tailored steps to the NR-T permitted comparable access to the JF. Neuronavigated TI-A with the short-rerouting technique permits wider access to the JF compared with the NR-T. However, the tailored NR-T provides comparable access to the JF and may be a better option for class C1 and selected class C2 and C3 JFPs.

An evaluation of morphometry and dehiscence of facial canal: a systematic review and meta-analysis of observational studies.

The facial canal (FC) is an extensive bony canal that houses the facial nerve and occupies a central position in the petrous part of temporal bone. It is of utmost significance to otologists due to its dehiscence and relationship to the inner or middle ear components. The main objectives of current investigation are to detect variations in the reported values ​​of FC anatomy that may occur due to different methodology and to elucidate the influence of age and ethnic factors on the morphological features of FC. The methodology is adapted to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Pooled weighted estimation was performed to calculate the mean length, angle, and prevalence of dehiscence. The cross-sectional shape of FC varied from circular to ellipsoid index and is 1.45 [95% CI, 0.86-2.6]. The mean length of the FC is 34.42mm [95% CI, 27.62-40.13mm] and the mean width or diameter is 1.35mm [95% CI, 1.013-1.63mm]. The length of the FC in fetuses and children is 21.79mm [95% CI, 18.44-25.15mm], and 26.92mm [95% CI, 23.3-28.3mm], respectively. In meta-regression, age is observed as a predictor and accounts for 36% of the heterogeneity. The prevalence of FC dehiscence in healthy temporal bones is 29% [95% CI, 20-40%]. The different segments of the FC exhibit significant variability and an unusually high incidence of dehiscence, which could potentially have clinical implications for the etiopathogenesis of facial nerve dysfunction.

Exposure of the facial nerve within the facial canal: A technical report

BackgroundThe facial canal lies in the petrous part of the temporal bone and contains the facial nerve. The facial canal and nerve are divided into three segments: the labyrinthine, tympanic and mastoid segments, which travel in different planes. These segments are closely related to the structures of the middle- and inner-ear, so pathology of the intracranial facial nerve is often evident in cochlear implant users. The facial canal and nerve are of great concern to otologists during electrode placement for a cochlear implant, as any damage to the nerve may result in untreatable facial paralysis. Few studies have been conducted on a cadaveric population, with most carried out on CT images of the cochlea and facial nerve. Thus, there is no standard or straightforward methodology to visualise the facial canal and nerve directly. We propose a detailed dissection technique to bridge this gap in research. MethodFour cadavers were used, and both the left and right facial canals were dissected. After the exposure of the cranial floor, the internal acoustic meatus and the facial canal were dissected out using drilling tools to remove the surrounding temporal bone and expose the facial nerve within the facial canal. ResultsThis technique allowed for morphometric analyses and observations of the facial canal in relation to the middle- and inner-ear. ConclusionKnowledge of the facial canal may assist otosurgeons in safely dissecting the region without injuring vital structures within this area.

The prevalence of facial canal dehiscence: first cross-sectional study in Iraq

BackgroundThe facial nerve is considered a crucial structure and is vulnerable to injury during middle ear and mastoid surgery. The facial canal could be dehiscent in certain populations; therefore, identifying it and avoiding injury to the nerve is an important step during otological surgeries. In this study, we assessed the rate of facial canal dehiscence (FCD) among patients undergoing surgery due to the presence of chronic suppurative otitis media (CSOM).MethodsA cross-sectional study was performed between June 2019 and May 2023. We included 102 patients (aged 8–70 years), admitted for primary tympanomastoid exploration due to the presence of CSOM with and without cholesteatoma at Azadi Teaching Hospital in Duhok/Iraq. Cases with a history of trauma or craniofacial abnormalities were excluded from the study. Also, none of the selected patients complained of facial nerve disorders.ResultsAmong the 102 patients who were admitted, 11.76% (n = 12) had FCD; they were between the ages of 11 and 58 (average: 30.9) years (18.8% ≤ 18 years vs. 10.5% > 18 years, p = 0.396). The dehiscence was more common in males than females (14.3% vs. 10.0%, p = 0.545) and was also more common on the left side than the right side (13.8% vs. 9.1%, p = 0.547). Of those with the dehiscent facial nerve, 83% (n = 10) had the dehiscence on the tympanic segment. The dehiscence was statistically more common in patients with cholesteatoma than those without (25.9% vs. 6.7%, p = 0.014).ConclusionDehiscence in the facial nerve can be encountered in patients with CSOM, particularly those with cholesteatoma. In such patients, the dehiscence is most commonly found on the tympanic segment of the facial nerve, so care should be taken during surgery for such cases to avoid injury of the nerve.

Clinical diagnosis and treatment analysis of spontaneous cerebrospinal fluid otorrhoea

Objective:To investigate the clinical features, imaging findings, surgical methods， diagnostic and treatment experience of spontaneous cerebrospinal fluid otorrhoea. Methods:The clinical data of 11 patients with spontaneous cerebrospinal fluid otorrhoea treated surgically at our hospital from May 2018 to May 2023 were retrospectively analyzed. The medical data included medical history, imaging data, leak location, surgical repair method, treatment effect and postoperative follow-up. Results:Among the 11 surgical patients, 4 patients were initially diagnosed with secretory otitis media, 1 was initially diagnosed with purulent otitis media, and 5 patients had a history of meningitis or presented because meningitis as the initial diagnosis. There were 2 cases of cerebrospinal fluid leakage repaired through the ear canal pathway and 9 cases of cerebrospinal fluid leakage repaired through the mastoid pathway. During the operation, leaks were located in the stapes floor plate in 4 cases, sinus meningeal angle in 1 case, posterior cranial fossa combined with middle cranial fossa in 1 case, middle cranial fossa in 4 cases, and labyrinthine segment of the internal auditory canal and facial nerve canal in 1 case. Ten patient was successfully repaired, and another patient developed intracranial hypertension after surgery, with symptoms alleviated by a lateral ventriculoperitoneal shunt. Postoperative follow-up ranged from 6 months to 4 years, and there was no CSF otorrhoea and meningitis recurrence. Conclusion:The incidence of spontaneous cerebrospinal fluid otorrhea is low, the clinical symptoms are atypical, and the rate of delayed diagnosis or missed diagnosis and misdiagnosis is high. Surgery is currently the preferred treatment for spontaneous cerebrospinal fluid otorrhoea, and satisfactory results are usually achieved; During diagnosis and treatment, it is crucial to be vigilant for intracranial hypertension to prevent serious complications and irreversible damage.

The Role of Temporal Bone Pneumatization on Fracture Line and Involved Cranial Structures.

Temporal bone pneumatization (TBP) is speculated to serve as a shock absorber in temporal bone fractures (TBF), directing the fracture line away from vital structures. This study correlates TBP extent with TBF patterns and preservations of vital TB structures. Retrospective cohort study. Tertiary referral medical center. All TBF patients referred to a single tertiary center 2017 to 2023 were evaluated. A pneumatization index score for each of their TBs was derived by counting automated-voxel density in a 0 to 100 scale. Results were correlated to the TBF type and the violated structure(s). The ossification index was compared to previously detailed qualitative classification systems of TBP. One hundred and forty-five patients were enrolled (mean age 43 ± 17 years). Kinematics were motor vehicle accidents (46%), scooter (15%), bicycle (14%), falls (13%), and assaults (8%). The mastoid ossification index we used showed a strong correlation to all qualitative classification systems (sigmoid = 0.829; labyrinthine = 0.849; carotis = 0.863, infralabyrinthine = 0.869, all P < .001). The pneumatization index strongly correlated with capsule-violating TBFs, with a mean of 44 ± 23 for otic capsule-sparing TBF and 61 ± 20 for otic capsule-violating (OCV) TBF (P < .001). The facial nerve was violated in 30 patients. Facial canal (FC) involvement was not correlated to the ossification index: it was 49 ± 23 for FC-sparing and 44 ± 23 for FC-violating (P = .620). TBP serves as a protective mechanism against OCV TBF. The more pneumatized the TB, the less likely the otic capsule will be violated in the event of a TBF with the exception of the carotid and FCs. TBP index is in strong agreement with qualitative TBP classification systems.

The Extra-Extended Translabyrinthine Approach for Resection of Large Acoustic Neuroma: 2-Dimensional Operative Video.

The extended translabyrinthine approach to acoustic neuroma (AN) was created to allow improved visualization and access to larger tumors.1,2 The dural opening, however, remained confined to the presigmoid space. Other authors have introduced modifications to increase the dura exposure around the internal auditory canal (IAC).3-5 The extra-extended translabyrinthine approach was conceptualized by the senior author (CC) to maximize AN exposure and early cranial nerve identification. The tentorial peeling was added to allow extradural mobilization of the temporal lobe.6 This allows further safe bone removal around the IAC and petrous apex and consistent opening of the facial canal at IAC fundus. This modification creates 280-to-360-degree dura exposure at the IAC. The dural opening extends to the petrous apex superiorly and the prepontine arachnoid cistern inferiorly and includes resection of a tentorium dural flap created by the tentorial peeling.6 This exposure allows for near circumferential exposure of the tumor and early identification of the glossopharyngeal nerve in the cochlear aqueduct area, the trigeminal nerve at the porus trigeminal, and the facial nerve (FN) at IAC fundus. In addition, this ample exposure permits identification of the FN trajectory in the tumor capsule before any tumor dissection. We present a detailed video of extra-extended translabyrinthine approach technique in a patient with a large left AN (Hannover classification T4B).7 This video does not involve any human research projects not requiring Institutional Review Board/ethic committee approval. The patient consented to the procedure and to the publication of his image. Complete resection was obtained. The FN function was House-Brackman I/VI.

Anatomical features of the mastoid segment of the facial canal.

Considering the tortuous course of the facial canal that houses the facial nerve, the stylomastoid artery and the homonymous vein, its morphological features are of great clinical significance in otologic, maxillofacial, oncologic, reconstructive and plastic surgery of the head and neck. The aim of this paper was to determine the individual specific features of the mastoid segment of facial canal and of the stylomastoid foramen. The study was carried out on 82 temporal bones (41 right/41 left), at the Department of anatomy and clinical anatomy of Nicolae Testemitanu State University of Medicine and Pharmacy of the Republic of Moldova. The morphometry of the mastoid segment of the facial canal and of the stylomastoid foramen was performed. The morphometric parameters were statistically analyzed by descriptive and inferential statistics methods. The mastoid segment exited the facial canal by an obtuse, right and sharp angles, with a mean value of 113.1 ± 21.80° (right/left - 112.1 ± 23.85°/114.1 ± 19.76°), p = 0.701. The mean length of the mastoid segment was 15.1 ± 3.78 mm (right/left - 15.7 ± 3.66 mm/14.5 ± 3.84 mm), p = 0.153. The longitudinal diameter of the stylomastoid foramen had a mean of 3.0 ± 0.93 mm (right/left - 3.3 ± 0.96 mm/2.7 ± 0.81 mm), p = 0.007. The transverse diameter had a mean of 2.6 ± 0.74 mm (right/left - 2.9 ± 0.80 mm/2.4 ± 0.60 mm), p = 0.012. In otologic surgery and particularly in mastoidectomy, it should be taken into consideration that the mastoid segment of the facial canal could exit the temporal bone by a sharp, right and obtuse angles that along with high morphological variability of the stylomastoid foramen might be a predisposal factor for Bell's palsy.

Prımary External Audıtory Canal Cholesteatoma

Abstract External auditory canal (EAC) cholesteatoma is characterized by a bony defect in the auditory canal with a cystic structure lined by keratinizing stratified squamous epithelium and retention of keratin debris. Clinically, patients present with chronic dull pain, otorrhea, or conductive hearing loss. Lamellar keratin debris in a bony defect in the case of an intact tympanic membrane is highly suggestive of external ear canal cholesteatoma. It must be differentiated from keratosis obturans. The locally erosive and indolent nature of cholesteatoma in the bony external ear canal may result in complications due to erosion into adjacent structures such as mastoid cells, semicircular canals, fallopian canal, and temporomandibular joint. The treatment options include conservative therapy and surgery. In this case report, we presented a 75-year-old male with a primary left EAC cholesteatoma underlining the diagnostic and therapeutic features of this rare disease.

Distribution and anti-nociceptive function of endomorphin-1 in the rat cranial sensory ganglia.

Distribution of endomorphin-1 (EM-1) was immunohistochemically investigated in the rat cranial sensory ganglia. Small to medium-sized neurons in the trigeminal (TG), petrosal (PG), and jugular ganglia (JG) expressed EM-1-immunoreactivity. However, EM-1-immunoreactive (-ir) neurons were infrequent in the nodose ganglion. In the brainstem, EM-1-ir varicose fibers were detected in the superficial layer of the medullary dorsal horn and the caudal part of the nucleus tractus solitarius. By trichrome immunofluorescence analysis, approximately 70% of EM-1-ir neurons were also immunoreactive for transient receptor potential vanilloid 1 (TRPV1) in all the examined ganglia. Additionally, 56.8% of EM1-ir TG neurons and approximately 30% of EM-1-ir PG and JG neurons showed calcitonin gene-related peptide (CGRP)-immunoreactivity. By a retrograde tracing method, several TG, PG, and JG neurons innervating the facial and external ear canal skin expressed EM-1-immunoreactivity. However, EM-1-ir neurons innervating the tooth pulp, circumvallate papilla, and pharynx were relatively rare. Thus, EM-1 expression and its coexistence with TRPV1 and CGRP in the cranial sensory neurons may depend on their various peripheral targets. EM1-ir neurons probably project to the superficial layer of the medullary dorsal horn and caudal part of the nucleus tractus solitarius. EM-1 may be involved in nociceptive transmission from the skin.

The imaging presentations of the fallopian canal cerebrospinal fluid leaking

Objective: To summarize the imaging presentations of the fallopian canal cerebrospinal fluid leaking (FCCFL). Methods: The high resolution CT (HRCT)and MRI materials of 4 patients (4 ears) with FCCFL confirmed by surgery between August 2016 to November 2023 were retrospectively analyzed. Among these, there were 2 males and 2 females, their ages ranged from 6 to 69 years. Results: All of the FCCFL were unilateral, including 2 on the left and 2 on the right.Clinically, the patients with FCCFL suffered from clear nasal fluid flow, ear tightness, and hearing loss. On CT, all of the affected ears were depicted markedly dilatation of the proximal portion of fallopian canal(FC), the labyrinthine segment and geniculate fossa were involved in 4 cases, and involvement of tympanic segment in 1 case at the same time. The geniculate fossa in the affected side were significantly enlarged, protruding upwards into the tympanic cavity, with one case simultaneously involving the cochlea. On MRI, the hyposignal on T1WI and hypersignal on T2WI or water sequence like cerebrospinal fluid (CSF) were shown in the enlargement FC, without diffusion restriction, and non-enhancing with administration Gadolinium contrast.CSF-like signal effusion was shown in all of the affected tympanum, of which, the CSF-like signal effusion was demonstrated in the area along the superficial petrosal nerve, the right pterygopalatine fossa and the parapharyngeal space. The adjacent intracranial meninges were presented thickening in 3 cases. Conclusion: The imaging appearances of FCCFL present some characteristics:on HRCT, the proximal portions of the affected FC depicts markedly enlargement,especially the geniculate fossa.While they present CSF-like signal, no diffusion restriction, and no enhancement administration, Gadolinium contrast on MRI, accompanying the CSF-like signal effusion in the affected tympanum.

Pathophysiology of Facial Nerve Stimulation and Its Implications for Electrical Stimulation in Cochlear Implants.

A small number of cochlear implant (CI) users experience facial nerve stimulation (FNS), which can manifest as facial twitching. In some patients, this can be resolved by adjusting the electrical stimulation parameters. However, for others, facial stimulation can significantly impair CI outcomes or even prevent its use. The exact mechanisms underlying FNS are unclear and may vary among patients. Transimpedance measurements were used to assess lateral and longitudinal spread of current within 15 cochlea of nucleus CI recipients with FNS (13 unilateral recipients and 1 bilateral recipient). We compared the transimpedance measurements with programming parameters from clinical visits and pre- and postoperative temporal bone computed tomography (CT) scans to identify factors that may contribute to FNS in each CI ear. In nine ears, transimpedance curves showed inflection, which suggests a localized current sink within the cochlea. This indicates a low-impedance pathway through which current exits the cochlea and stimulates the labyrinthine segment of the facial nerve canal. Electrodes near this current sink were disabled or underfit to minimize facial stimulation. In the other seven ears, current flow peaked toward the basal end of the cochlea, suggesting that current exits through the round window or other structures near the basal end of the cochlea, stimulating the tympanic segment of the facial nerve. Objective transimpedance measurements can be used to elucidate the mechanisms of FNS and to develop strategies for optimizing electrical stimulation parameters and speech coding to minimize or eliminate FNS in a small subset of CI users.

Modified radical mastoidectomy in chronic otitis media: year outcome post-surgery

Background: Cholesteatoma is defined as erosive process, eroding ossicular chain, scutum, otic-capsule, fallopian canal and tegmun. Surgical management of cholesteatoma includes mastoidectomy. The aim of the study was to focuss on MRM: indications and outcomes of procedure. Methods: This study aims at knowing the indications and outcome of MRM after 1 year in terms of success rate, efficacy and patient’s satisfaction. It involves study over 42 patients who underwent surgery and were followed over a period of one year post surgery. Results: After 1 year of MRM 64.27% showed hearing improvement, 95.2% had dry and settled cavity, and there was no post-operative facial palsy, and SNHL. Conclusions: MRM is a procedure of choice for COM with extensive disease of mastoid. A meticulous and skilled MRM gives a well fashioned mastoid cavity with minimum or no recurrence/post-operative complications with a satisfactory hearing outcome.

Jugular Foramen Paragangliomas.

Paragangliomas are the most common tumors at jugular foramen and pose a great surgical challenge. Careful clinical history and physical examination must be performed to adequately evaluate neurological deficits and its chronologic evolution, also to delineate an overview of the patient performance status. Complete imaging evaluation including MRI and CT scans should be performed, and angiography is a must to depict tumor blood supply and sigmoid sinus/internal jugular vein patency. Screening for multifocal paragangliomas is advisable, with a whole-body imaging. Laboratory investigation of endocrine function of the tumor is necessary, and adrenergic tumors may be associated with synchronous lesions. Preoperative prepare with alpha-blockage is advisable in norepinephrine/epinephrine-secreting tumors; however, it is not advisable in exclusively dopamine-secreting neoplasms. Best surgical candidates are young otherwise healthy patients with smaller lesions; however, treatment should be individualized each case. Variations of infratemporal fossa approach are employed depending on extensions of the mass. Regarding facial nerve management, we avoid to expose or reroute it if there is preoperative function preservation and prefer to work around facial canal in way of a fallopian bridge technique. If there is preoperative facial nerve compromise, the mastoid segment of the nerve is exposed, and it may be grafted if invaded or just decompressed. A key point is to preserve the anteromedial wall of internal jugular vein if there is preoperative preservation of lower cranial nerves. Careful multilayer closure is essential to avoid at most cerebrospinal fluid leakage. Residual tumors may be reoperated if growing and presenting mass effect or be candidate for adjuvant stereotactic radiosurgery.

Cholesteatoma Surgery With Three Different Methods: A Clinical Study For Recidivism Research

Introduction: The study aimed to determine the rates of recidivistic disease after primary surgery, localization of cholesteatoma, pathologic findings detected during the operation, and the additional surgical procedures performed in patients with chronic otitis media with cholesteatoma. Materials and Methods: Three hundred forty-five patients suspected of chronic otitis media with cholesteatoma searched their files and operation notes in Cukurova University Hospital between January 2010 and January 2020 retrospectively. Three surgical techniques were applied: Canal Wall Down (CWDM), Canal Wall Up (CWUM), and Radical (RM) mastoidectomy. Cholesteatoma localization, ossicular system status, condition of the facial canal, semicircular canal defects, tegmen defect, tympanoplasty, and whether hearing reconstruction is performed were investigated. In follow-up, revision surgeries were performed on 61 patients with suspicions of recidivistic disease. The revision surgery region was where cholesteatoma was detected, and the condition of the ossicles was investigated. Patients' demographic characteristics, follow-up time, the recidivism rate in surgical method, cholesteatoma localization in the first surgery, and cholesteatoma localization in revision surgery were compared. Results: 27.2% of 345 patients were CWUM, 23.5% were CWDM, and 49% were RM. Cholesteatoma localization was 60.9% of them in mastoid cavities, 59,4% of them in the attic and epitympanum, 56,2% of them in the middle ear, and 12,8% of them in only sinus tympani and facial recesses. Patients were followed for a mean of 36 months. In the follow-up period, revision mastoidectomy was performed for ten patients with recidivistic disease. Revision rates after CWUM were 62,3%, revision rates after CWDM were 9,8%, and revision rates after RM was 27,9%. Conclusions. The choice of surgical procedure is an essential parameter in forming a recidivistic disease. Especially in open technical surgeries (CWDM and RM), the risk of recidivistic disease is significantly lower than that of closed technical surgeries (CWUM). Keywords: Cholesteatoma, recidivistic disease, ossicle erosion, radical mastoidectomy

Correlative Study of High-Resolution Computed Tomography Temporal Bone with Intraoperative Findings in Tympanomastoid Surgery

Abstract Introduction: The global incidence of chronic otitis media (COM) is approximately 4.76 per thousand, with 31 million cases causing various complications. Most of these patients require one of the various forms of mastoid surgeries. High-resolution computed tomography (HRCT) has greatly improved the ability to assess both bony architecture and soft-tissue status. Aim: The aim is to assess the correlation of HRCT temporal bone with intraoperative findings in tympanomastoid surgery and to evaluate the sensitivity, specificity, positive predictive value, and negative predictive value of HRCT temporal bone. Materials and Methods: This prospective study was conducted in the Department of Otorhinolaryngology, SDM College of Medical Sciences and Hospital, Dharwad from November 2012–April 2014. Fifty patients of COM were taken up for study who underwent preoperative HRCT temporal bone followed by appropriate tympanomastoid surgery. Results: HRCT temporal bone showed increased sensitivity and specificity in detecting ossicular chain erosion and soft tissue abnormality within the middle ear and mastoid air cells. Facial nerve canal erosion was correctly detected in 62.50%, and overall agreement between surgical findings and the scan was high (90%). It also showed a very high specificity of 95.24%. For semicircular canal erosion and dural plate erosion, sensitivity was 50% each, specificity was 100% and had a very good correlation with surgical findings. Two cases of erosion of the posterior bony wall of the external auditory canal were correctly detected by the HRCT scan. Conclusion: HRCT temporal bone was found to have a high overall correlation with surgical findings and can be a useful method for early diagnosis of complications of COM and preoperative assessment.

Intraoperative diagnosis of facial schwannomas: a multicenter summation of clinical experience, preoperative avoidance, and intraoperative management protocol.

Preoperative differentiation of facial nerve schwannoma (FNS) from vestibular schwannoma (VS) can be challenging, and failure to differentiate between these two pathologies can result in potentially avoidable facial nerve injury. This study presents the combined experience of two high-volume centers in the management of intraoperatively diagnosed FNSs. The authors highlight clinical and imaging features that can distinguish FNS from VS and provide an algorithm to help manage intraoperatively diagnosed FNS. Operative records of 1484 presumed sporadic VS resections between January 2012 and December 2021 were reviewed, and patients with intraoperatively diagnosed FNSs were identified. Clinical data and preoperative imaging were retrospectively reviewed for features suggestive of FNS, and factors associated with good postoperative facial nerve function (House-Brackmann [HB] grade ≤ 2) were identified. A preoperative imaging protocol for suspected VS and recommendations for surgical decision-making following an intraoperative FNS diagnosis were created. Nineteen patients (1.3%) with FNSs were identified. All patients had normal facial motor function preoperatively. In 12 patients (63%), preoperative imaging demonstrated no features suggestive of FNS, with the remainder showing subtle enhancement of the geniculate/labyrinthine facial segment, widening/erosion of the fallopian canal, or multiple tumor nodules in retrospect. Eleven (57.9%) of the 19 patients underwent a retrosigmoid craniotomy, and in the remaining patients, a translabyrinthine (n = 6) or transotic (n = 2) approach was used. Following FNS diagnosis, 6 (32%) of the tumors underwent gross-total resection (GTR) and cable nerve grafting, 6 (32%) underwent subtotal resection (STR) and bony decompression of the meatal facial nerve segment, and 7 (36%) underwent bony decompression only. All patients undergoing subtotal debulking or bony decompression exhibited normal postoperative facial function (HB grade I). At the last clinical follow-up, patients who underwent GTR with a facial nerve graft had HB grade III (3 of 6 patients) or IV facial function. Tumor recurrence/regrowth occurred in 3 patients (16%), all of whom had been treated with either bony decompression or STR. Intraoperative diagnosis of an FNS during a presumed VS resection is rare, but its incidence can be reduced further by maintaining a high index of suspicion and undertaking further imaging in patients with atypical clinical or imaging features. If an intraoperative diagnosis does occur, conservative surgical management with bony decompression of the facial nerve only is recommended, unless there is significant mass effect on surrounding structures.

High-Resolution Computed Tomography in Middle Ear Cholesteatoma: How Much Do We Need It?

Background and Objectives: The diagnosis of cholesteatoma is usually clinic, and the only efficient treatment is surgical. High-resolution computed tomography (HRCT) is not considered absolutely necessary for the management of an uncomplicated cholesteatoma, but unsuspected situations from a clinical point of view can be discovered using the scans, warning the surgeon. Our objective is to compare HRCT scan information with intraoperative findings in patients with cholesteatoma and analyze the usefulness of a preoperative HRCT scan from a surgical point of view. Materials and Methods: This is a prospective descriptive study conducted in the Department of Otolaryngology, Victor Babes University of Medicine and Pharmacy Timisoara, Romania, from May 2021 to April 2022. It was carried out on 46 patients with a clinical diagnosis of cholesteatoma who were consequently operated on in our department. All patients received full clinical and audiological examinations. In all cases, an HRCT scan was performed preoperatively as a mandatory investigation. Preoperative HRCT scans were analyzed, and their findings were compared to the intraoperative notes. The two sets of observations were analyzed using standard statistical methods. Results: Extensive cholesteatoma was the most common type of disease, involving 46% of the patients, followed by pars flaccida cholesteatoma (35%) and pars tensa cholesteatoma (19%). Eroded scutum was the most frequent lesion involving 70% of the patients, followed by incus erosion (67%). Comparison of the HRCT and intraoperative findings revealed a very good correlation for tegmen tympani erosion, sigmoid plate erosion, scutum and malleus erosion, and a moderate-to-good correlation for lateral semicircular canal erosion, incus and stapes erosion, and fallopian canal erosion. Conclusions: HRCT is a valuable tool in the preoperative assessment of cholesteatoma, helping in making surgical decisions. It can accurately predict the extent of disease and is helpful for detecting unapparent dangerous situations. However, it is not very accurate in detecting fallopian canal and stapes erosion.

Comparison of Preoperative Computerized Tomograghic Scan of Temporal Bone Findings with Intra Operative Findings in Patients with Chronic Otitis Media Undergoing Tympanomastoidectomy: A Descriptive Study

Background: Since ancient times, chronic suppurative otitis media (CSOM) has been a significant contributor to middle ear illness. Antibiotics have been extremely helpful, but (CSOM) is still a frequent condition, and its consequences present a challenge to both otologists and radiologists. Due to the intricate anatomical nature of the middle ear and inner ear, radiological assessment of the temporal bone is challenging.&#x0D; Aim of the Study: To compare between preoperative CT scan findings of the temporal bone with the operative findings in patients with CSOM undergoing tympanomastoidectomy.&#x0D; Methodology: A Descriptive cross-sectional prospective has been adopted and 35 patients with Chronic Suppurative Otitis Media were admitted at the Department of Otolaryngology/ Alsulaymaniyah Teaching Hospital of Otolaryngology, Head and Neck Surgery, and Zhian Hospital during the period from February to December 2015. A detailed history and careful physical examination, clinical tests revealed that all of the patients had Chronic Suppurative Otitis Media, typically with discharge from the ear and hearing loss. Each patient had their clinical history collected, and they all underwent a thorough ear, nose, and throat examination as well as an attentive otoscopic and microscopic ear examination. Additionally, all patients underwent an audiological evaluation that included pure tone audiometry, tympanometry, and HRCT.&#x0D; Results: Thirty -five patients were included in this study. The mean age of the patients was 33 years; 51.4% were males and 48.6% were females. The most common presenting symptom was aural discharge in 71.4%; the second one was hearing loss in 28.6%. Mastoid pneumatization was found in 82.9% by CT while by surgery, it was found in 17.1%. CT findings showed that middle ear involvement in 11.4%, mastoid involvement in 11.4%, mastoid with middle ear involvement in 54.3%, and EAC, mastoid, and middle ear involvement in 17.1%. While the surgical findings showed middle ear disease in 20%, mastoid involvement in 11.4%, mastoid with middle ear involvement in 57.1%, and EAC, mastoid and middle ear involvement in 11.4%. The CT findings for eroded Malleus, Incus integrity, and stapes in 31.4%, 37.1%, not visualized while surgical findings showed eroded Malleus, Incus, and stapes integrity that 28.6%, 54.3%, and 28.6% respectively. The CT findings for an eroded facial canal, the lateral semicircular canal, the posterior external auditory canal wall, and sigmoid sinus plate integrity were 12.4%, 8.6%, 22.9%, and 11.4% in that order, while the surgical findings of the eroded facial canal, the lateral semicircular canal, and the posterior external auditory canal wall were found in 20.0%, 5.7%, 17.1%, and 14.2% respectively. Both CT and surgical findings of Integrity of the tegmen showed that 32 patients (91.4%) were found to have intact tegmen, and 3 patients (8.6%) had eroded tegmen and both showed that the eroded scutum found in 25.7%.&#x0D; Conclusions: The current study concluded a positive correlation between CT and surgical findings that has many advantages in preoperative planning for the eradication of the disease, choosing the best approach &amp; has a very important role in the orientation of the surgeon during the surgery to avoid any possible complications.