Pneumatic Type Research Articles

Articular eminence pneumatization in patients with different sagittal skeletal patterns: Cone-beam computed tomography study

Objectives: This study objectives to evaluate the type and degree of articular eminence pneumatization in individuals with different sagittal skeletal patterns. Material and Methods: Cone-beam computed tomography images of 139 patients were included in the study. The population was divided into groups according to their sagittal skeletal anomalies by A point-nasion-B point angle measurement. The laterality, grade, and type of pneumatization were recorded. Pearson Chi-square test and Fisher’s exact test were performed to evaluate gender, sagittal skeletal anomalies, pneumatization type, and grade. Results: A pneumatized articular eminence (PAT) was found in 74.8% of the population. Grade 1 pneumatization and the multilocular type where the most common pneumatization. There were no correlations between sagittal skeletal anomalies and pneumatization grades. Conclusion: The prevalence of PAT was high concerning the previous studies. However, there were no correlations between the sagittal skeletal anomalies, pneumatization type, and grade. Clinicians must always be aware of the potential for pneumatizations as they may cause untoward complications.

The anatomical variability of the sphenoid sinus in CBCT - a retrospective study

Summary
 The aim of this retrospective study was to assess and illustrate the anatomical variability of the sphenoid sinus (SPS) on cone-beam computed tomography (CBCT) scans. A total of 50 SPS were assessed. CBCT images were oriented in the sagittal plane to evaluate the type of pneumatization (conchal, presellar, sellar and postsellar). Size measurements (width, length and height) of the SPS as well as the septation pattern and the presence or absence of pathologies were examined in all three planes. The postsellar type (28 cases, 56%) was the most common pattern of pneumatization. Conchal, presellar, or sellar pneumatization were significantly less frequent. There was only one case (2%) with a conchal and two cases (4%) with a presellar type. Multiple septa were found in 75% of patients with postsellar pneumatization, but only in 45.5% of patients featuring conchal, presellar or sellar type. In the postsellar category, all measured dimensions were significantly higher compared to the other types of pneumatization. Pathologies in the SPS were found in 7 patients (14%). It was concluded that the anatomical structure of the SPS is highly variable. Knowledge about its radiological appearance in CBCT will help in identification of pathologies and surrounding anatomical structures.
 Accepted for publication: June 9, 2020
 Published online: June 16, 2021
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Radioanatomical Features of the Sphenoid Sinus in the Ivorian Population

Background and purpose: The sphenoid sinus is characterized by the frequency of anatomical variants that cause operative difficulties and complications during the transphenoidal approach. These variants involve the geographic factor and the type of skin phenotype. Most of the studies have been carried out on European, North African and Asian populations. Some studies have been found in sub-Saharan Africa but not in Côte d’Ivoire. The aim was to determine, from CT data, the anatomical characteristics of the sphenoid sinus in the Ivorian population. Methods: Cranioencephalic computed tomography images of 100 patients (80 men and 20 women aged 16 to 71) were used for the study. These were patients who presented with head trauma without injury to the base of the skull. Were studied the anatomical characteristics of the sphenoid sinus. Results: The type of pneumatization was sellar in 58% sinuses, pre sellar in 41% and conchal in 1% of cases. The presellar type predominated in women (60%) and the sellar type in men (65.5%). Extensions were present in 66.34% of cases, more frequent in men (70%), in the sellar type (79.31%), and in the anterior clinoid process (46.20%). The procidence of vasculo-nervous structures was more frequent in men (52.62%) and in the sellar type (62.07%), the procidence of the internal carotid artery was bilateral in 30.69% of sinuses, that of the optic nerve was mainly unilateral left (07.92%) more frequent in women ( 10%) and in the sellaire type (09.43%). Dehiscence was present in 15% of cases. Dominance was straight in 63.64% of the sinuses. The Onodi cell was present in 65% of sinuses. The ostium was bilateral in (45%) of the sinuses. Conclusion: The Ivorian sphenoid sinus is highly pneumatized, facilitating access to the surgeon; the sellar type is the most frequent. On the other hand, the frequency of procidence and dehiscence of vasculo-nervous elements increases the risk of surgical complications. Differences between genders and between types of pneumatization should be considered in sphenoid sinus procedures. KEY WORDS: Sphenoid Sinus, Computed Tomography, Anatomic Variation, Ivorian. Background and purpose: The sphenoid sinus is characterized by the frequency of anatomical variants that cause operative difficulties and complications during the transphenoidal approach. These variants involve the geographic factor and the type of skin phenotype. Most of the studies have been carried out on European, North African and Asian populations. Some studies have been found in sub-Saharan Africa but not in Côte d’Ivoire. The aim was to determine, from CT data, the anatomical characteristics of the sphenoid sinus in the Ivorian population. Methods: Cranioencephalic computed tomography images of 100 patients (80 men and 20 women aged 16 to 71) were used for the study. These were patients who presented with head trauma without injury to the base of the skull. Were studied the anatomical characteristics of the sphenoid sinus. Results: The type of pneumatization was sellar in 58% sinuses, pre sellar in 41% and conchal in 1% of cases. The presellar type predominated in women (60%) and the sellar type in men (65.5%). Extensions were present in 66.34% of cases, more frequent in men (70%), in the sellar type (79.31%), and in the anterior clinoid process (46.20%). The procidence of vasculo-nervous structures was more frequent in men (52.62%) and in the sellar type (62.07%), the procidence of the internal carotid artery was bilateral in 30.69% of sinuses, that of the optic nerve was mainly unilateral left (07.92%) more frequent in women ( 10%) and in the sellaire type (09.43%). Dehiscence was present in 15% of cases. Dominance was straight in 63.64% of the sinuses. The Onodi cell was present in 65% of sinuses. The ostium was bilateral in (45%) of the sinuses. Conclusion: The Ivorian sphenoid sinus is highly pneumatized, facilitating access to the surgeon; the sellar type is the most frequent. On the other hand, the frequency of procidence and dehiscence of vasculo-nervous elements increases the risk of surgical complications. Differences between genders and between types of pneumatization should be considered in sphenoid sinus procedures. KEY WORDS: Sphenoid Sinus, Computed Tomography, Anatomic Variation, Ivorian.

Development of pneumatic artificial muscle type active ankle foot orthosis capable of assisting depending on the walking phase

Many ankle foot orthoses have been developed to assist the hemiplegic person in walking, but most of them are passive orthoses that can perform the necessary auxiliary functions only in a specific phase during walking. Therefore, we have developed an active ankle foot orthosis that divides the walking cycle into four phases by measuring the ground contact of the heel and the ball of the finger with a pressure sensor, and can set ankle plantar dorsiflexion motion assist depending on the phase.

The Effects of Suprabullar Pneumatization on the Orientation of Its Surrounding Anatomical Structures Relevant to the Frontal Drainage Pathway.

Objective: The aim of this study was to evaluate the effects of suprabullar pneumatization on the orientation of the frontal sinus outflow structures and its association with the volume of anterior ethmoid sinus. Methods: A retrospective chart review of computed tomography of paranasal sinuses (CTPNS) images was conducted. A total of 370 sides of the CTPNS of 185 patients were analyzed. Results: The course of anterior ethmoidal artery (AEA) along the skull base (p = 0.04) and position of AEA at the second lamella (p = 0.04) was significantly associated with the type of suprabullar pneumatization. The AEA is expected to be lower at the skull base and at a longer distance from the second lamella with the increase in grading of the suprabullar pneumatization. The distance of AEA to the second lamella (p < 0.001) and third lamella (p = 0.04) was significantly different depending on the type of suprabullar pneumatization, which indicates AEA is expected to be at a longer distance from the second lamella and third lamella in higher grade suprabullar pneumatization. The type of suprabullar pneumatization has a significant but weak association with the anterior ethmoid sinus volume (p = 0.04). Conclusions: There is a significant effect of the type of suprabullar pneumatization on the orientation of the surrounding anatomical structures at the frontal recess. The type of suprabullar pneumatization is influenced by the anterior ethmoid sinus volume, which suggests it has a possible role in the frontal drainage pathway.

Pituitary MRI Standard and Advanced Sequences: Role in the Diagnosis and Characterization of Pituitary Adenomas.

Pituitary adenomas (PAs) represent the most frequently found lesions in the sellar region; however, several other lesions may be encountered in this region, such as meningiomas, craniopharyngiomas, and aneurysms. High-quality imaging is fundamental for diagnosis, characterization, and guidance of treatment planning of PAs. Sellar magnetic resonance imaging (MRI) is considered the imaging modality of choice for the evaluation of lesions in the sella turcica. The sellar MRI standard protocol includes coronal and sagittal T1-weighted spin-echo sequencing with and without gadolinium-based contrast agent and coronal T2-weighted (T2w) fast-spin echo sequencing. A systematic MRI approach to the pituitary region generally provides information that includes the size and shape of the PA, the presence of cysts or hemorrhage within the tumor, its relationship with the optic pathways and surrounding structures, potential cavernous sinus invasion, sphenoid sinus pneumatization type, and differential diagnosis with other sellar lesions. The standard protocol is sufficient for the evaluation of most cases; however, some advanced techniques (susceptibility imaging, diffusion-weighted imaging, 3D T2w high-resolution sequences, magnetic resonance elastography, perfusion-weighted imaging) may render additional information, which may be important for some cases. In this "approach to the patient" manuscript, we will discuss the use of standard and advanced MRI sequences in the diagnosis and characterization of PAs, including MRI features associated with treatment response that may aid in presurgical evaluation and planning, and red flags that may point to an alternative diagnosis.

Endoscopic transsphenoidal removal of neoplasms of the chiasmal-sellar region in children

The OBJECTIVE was to analyze the results of endoscopic transsphenoidal removal of neoplasms of the chiasmalsellar region in children.MATERIALS AND METHODS. We studied 23 patients aged 3 to 17 years who underwent endoscopic transsphenoidal removal of neoplasms of the chiasmal-sellar region. Neurological, ophthalmological, endocrine disorders and otorhinolaryngological pathology were evaluated. Neuroimaging data (MRI and CT), results of laboratory tests were studied. In addition, the analysis of surgical treatment including intraoperative and early postoperative complications was performed.RESULTS. In 39.1 % of cases, neoplasms of supraparainfracellar localization were diagnosed. In 34.8 % of patients, the size of the neoplasms did not exceed 2 cm. In 1 patient, the volume of neoplasm was 53.7 cm3. According to the type of pneumatization, the sellar type prevailed. Сonch type was observed in 1 child. Hemostatic material «Surgicel Fibrillar» was used more often (86.9 %). Plastic surgery of the skull defect was carried out on a floor-by-floor basis with «Tachocomb» plates (62.5 %). Total tumor removal was achieved in 75 % of children. The majority of neoplasms were represented by craniopharyngioma – 30.43 %. In the early postoperative period, there was a significant regression of neurological disorders – by 69.6 %, as well as ophthalmological – by 34.8 % and endocrine – by 37.8 %. There were no cases of nasal liquorrhea and epistaxis in children.CONCLUSION. Our study demonstrated the success of removing neoplasms in children from 3 years old, regardless of the size of the nasal cavity and pneumatization of the sphenoid sinus. It is possible to use endoscopic transsphenoidal access in children to remove the neoplasms of the chiasmal-sellar region of more than 5 cm, since the risk of intra – and postoperative complications is minimized.

A Study of Anatomical Variations of Sphenoid Sinus on CT PNS: Our Experience.

Sphenoid sinus anatomical variations are very common, its prior knowledge is very essential while doing skull base surgery to avoid catastrophic complications which might be due to damage of surrounding neurovascular structures. This retrospective observational study was done to examine the different anatomical variations of sphenoid sinus on CT PNS which was conducted in KMCH, Katihar from May 2019 to April 2020 involving 60 cases above 15years of age who had undergone CT PNS. Sellar type of pneumatization was seen in 66.7%, pterygoid process pneumatization was seen in 25%. Single septation was present in 43.3%, septum attached to optic nerve was seen in 33.3%, onodi cell was seen in 36.7%, anterior clinoid process pneumatization was seen in 13.3% of cases. By this study we came to a conclusion that preoperative assessment of sphenoid sinus anatomy and its variations is mandatory to avoid surrounding neurovascular structure damage and CSF leak.

Sphenoid sinus pneumatization in a sample of Nepalese population: A multidetector computed tomography study.

&#x0D; Introduction: The purpose of study was to assess the prevalence of different types of pneumatization of sphenoid sinus in the Nepalese population as detected in CT scan of paranasal sinus. Materials and Methods: This study included patients attending radiology department for CT scan of paranasal sinus. The CT images of paranasal sinus were assessed for the type of pneumatization of the sphenoid sinus and type of clival, lateral recess and lesser wing extensions. Results: Most common type of pneumatization found in our study was complete sellar type (61.7%) and partial sellar type was second common type (27.4%). Pre-sellar type of pneumatization was seen in 10.9%. There were no patients with conchal type of pneumatization in our study. The clival extension of pneumatization was seen in 64%, lateral extension was found in 35.4%. and lesser wing type of pneumatization was found in 9.7%. Conclusion: Pre-surgical assessment of types and extension of sphenoid sinus pneumatization helps surgeons in surgical planning and to reduce complications during surgery. The variation in prevalence of sphenoid sinus pneumatization was found between our study population and other different population. This confirms that ethnicity influences types and extension of sphenoid sinus pneumatization.

THE USE OF FLOTATION METHOD FOR PURIFICATION OF WASTEWATERS CONTAMINATED WITH OIL PRODUCTS

Industrial and natural wastewater is one of the factors of environmental pollution, in particular, its water basin. Among others, fuel and oil pollutants are toxic substances that cause significant harm to all living things. It is necessary to create technologies using effective methods of wastewater treatment to solve such problems. It is possible to properly select and effectively use methods of treatment taking into account the nature, condition and concentration of contaminants in wastewater. These are the issues addressed in this article. Particular attention is paid to the use of flotation as a method of purification of stable highly dispersed emulsified wastewater containing oil or fuel contaminants in the technology of this type wastewater treatment. The main objectives of the study were to evaluate the impact of parameters and flotation reagents on the efficiency of the process of purification of stable highly dispersed emulsified wastewater. Flotation of these wastewaters was carried out on a laboratory flotation installation of pneumatic type and compared with the process of wastewater settling over time. Studies have shown that for stable emulsified wastewater containing oil or fuel contaminants with a low content of highly dispersed particles of inorganic nature or a stabilizer is present in them, it is advisable to use the flotation method with flotation units of pneumatic type. Analysing the results, it should be noted that the flotation method significantly reduces the purification time of highly dispersed emulsified wastewater from 3-5 hours of their settling in settling tanks-oil traps up to 10-20 minutes by the method of pneumatic flotation, while the degree of wastewater treatment increases in at least 1.5 - 2 times depending on the presence of fuel or oil contaminants in wastewater. If the wastewater contains a stabilizer, such as a surfactant, it can be used as an effective flotation reagent in the purification of this type of wastewater by flotation, which is not suitable for the settling process.

Temporal Bone Pneumatization: Relationship With Sex and Variants of the Ethmoid and Sphenoid Bone.

Pneumatization variants of the temporal bone have a crucial importance in several surgical interventions. However, very few data are known about possible correlation with other pneumatization variants.Pneumatization of glenoid fossa, petrous apex, and infralabyrinthine portion of temporal bone was assessed in 200 computed tomography scans, equally divided between males and females (18-92 years). Pneumatization variants of the ethmoid (concha bullosa, agger nasi, pneumatized crista galli) and the sphenoid sinuses (pneumatized pterygoid processes, anterior clinoid processes, dorsum sellae, volume) were recorded as well.Differences in prevalence of each pneumatization type according to sex and side, among different portions of the temporal bone, and between temporal bone and the pneumatized variants of the ethmoid bone and sphenoid sinuses, were assessed through chi-square test (P < 0.05). Differences in sphenoid volume among different pneumatization degrees of the temporal bone were assessed through 1-way analysis of covariance test (P < 0.05).Pneumatization of the petrous apex and the infralabyrinthine portion was significantly more frequent in males than in females, whereas pneumatization of the glenoid fossa was more often observed on the right side (P < 0.05). Variants of the temporal bone are all related one with each other in males, whereas in females only the relationship between pneumatized petrous apex and infralabyrinthine portion was found. Moreover, in females the pneumatized petrous apex was related with pneumatized anterior clinoid process, and the pneumatized infralabyrinthine portion was related with the sphenoid sinus volume.Results may be useful for predicting these important variants in planning surgical interventions of the cranial base.

The anatomical variability of the sphenoid sinus in CBCT - a retrospective study.

The aim of this retrospective study was to assess and illustrate the anatomical variability of the sphenoid sinus (SPS) on cone-beam computed tomography (CBCT) scans. A total of 50 SPS were assessed. CBCT images were oriented in the sagittal plane to evaluate the type of pneumatization (conchal, presellar, sellar and postsellar). Size measurements (width, length and height) of the SPS as well as the septation pattern and the presence or absence of pathologies were examined in all three planes. The postsellar type (28 cases, 56%) was the most common pattern of pneumatization. Conchal, presellar, or sellar pneumatization were significantly less frequent. There was only one case (2%) with a conchal and two cases (4%) with a presellar type. Multiple septa were found in 75% of patients with postsellar pneumatization, but only in 45.5% of patients featuring conchal, presellar or sellar type. In the postsellar category, all measured dimensions were significantly higher compared to the other types of pneumatization. Pathologies in the SPS were found in 7 patients (14%). It was concluded that the anatomical structure of the SPS is highly variable. Knowledge about its radiological appearance in CBCT will help in identification of pathologies and surrounding anatomical structures.

Does Sphenoid Pneumatization Affect the Angle of the Eustachian Tube?

Aim: In this study, we aimed to investigate the relationship between sphenoid sinus pneuma¬tization and the angle of the Eustachian tube. Methods: The study included a total of 158 patients. The Eustachian tube angle (ETA) was measured and sphenoid pneumatization was classified in the coronal plane. Results: According to the coronal classification of sphenoid pneumatization, 52 (16%) hemi-sphenoids were type 1, 177 (56%) hemi-sphenoids were type 2, and 87 (27.5%) hemi-sphe¬noids were type 3. According to the sagittal classification, 24 (7.6%) hemi-sphenoids were pre-sellar, 101 (32%) hemi-sphenoids were sellar, and 191 (60.4%) hemi-sphenoids were post-sellar. The mean ETA in coronal classification was 24.71±3.35, 25.03±3.24, and 25.90±3.10 de¬grees for the type 1, type 2, and type 3 classes, respectively. The angle showed a gradual increase from type 1 to type 3, and it was found that ETA was statistically significantly wider in cases with lateral recess pneumatization (type 3, post-rotundum) than in type 2 and type 1 pneumatizations (p=0.039, p=0.035, respectively). Conclusion: ETA is increased in patients with lateral recess pneumatization.

CFD study of aerodynamic performance of non-pneumatic tyre with hexagonal spokes

Non-pneumatic tyres (NPT) provide a greater advantage over the pneumatic type owing to their construct which increases the reliability of the tyre operation and effectively reduces maintenance involved. Analysing the aerodynamic forces acting on a NPT becomes a crucial factor in understanding it’s suitability for practical implementation. In the present work, the aerodynamic performance of a NPT using CFD tool – SimScale® is studied. This work includes a comparative study of a pneumatic tyre, a NPT with wedge spokes and a NPT with hexagonal spokes (NPT-HS). The effect of air velocity, steering (yaw) angle and camber angle on the aerodynamic performance of the NPT-HS is evaluated using CFD. By increasing the steering angle from 0° to 15°, the lift coefficient decreases by 37% approximately at all velocities. Whereas drag coefficient initially decreases by 21% till 7.5° steering angle and then starts increasing. Increasing camber angle from 0° to 1.5°, both drag and lift coefficients goes on decreasing by approximately 7% and 27% respectively.

Anatomical peculiarities of the sphenoidal sinus based on computed tomography data: structural types and correlation with maxillary sinuses

Detailed knowledge of anatomy and topography of sphenoidal and maxillary sinuses may help to improve surgical approaches, better predict postoperative complications, increase safety of surgical techniques, and, consequently, avoid inflammatory reactions. This also helps to determine the cause of inflammatory changes.&#x0D; Aim. This study aimed to analyze structural types of sphenoidal and maxillary sinuses by examining computed tomography (CT) images of the paranasal sinuses, to determine the frequency of the interposition of the internal carotid artery, and to identify sex- and age-related peculiarities and regularities in the extent of pneumatization and contents in the sphenoidal and maxillary sinuses.&#x0D; Materials and Methods. CT images of 50 patients who were receiving treatment in the otolaryngology unit of the Clinic of SamSMU were analyzed. Toshiba Aquilion 32 CT scanner was used.&#x0D; Results. Patients were divided into three groups according to Hamberger classification of the pneumatization of the sphenoidal sinus by taking into account the topographic relation to the sella turcica using CT data: the presellar type was identified in 10% (n=5) of the cases, the sellar type in 22% (n=11), and the postsellar type in 68% (n=34). The postsellar type is the most common structural type of the sphenoidal sinus. Moreover, patients were divided into groups by the type of pneumatization of the maxillary sinuses. No correlation was found between the pneumatizations of sphenoidal and maxillary sinuses. Moderate negative correlation was observed between age and structural type of the sinuses, and moderate positive correlation was found between the contents of the sinuses. Interposition of the internal carotid arteries was identified in 3 (6%) patients.&#x0D; Conclusions. Our data revealed that the postsellar type is the most common structural type of sphenoidal sinuses. The extent of pneumatization of the sphenoidal and maxillary sinuses is independent of each other. Anatomical peculiarities of the sphenoidal sinus in the form of the interposition of the internal carotid arteries are not very rare and should be taken into account in planning surgical interventions.

Anatomical Variants, Pneumatization Classification, and Volumetric Studies of the Sphenoid Sinus With High-Resolution Computed Tomography.

Aimed to explore the correlation between the volume of the sphenoid sinuses (SS) and sex, age, pneumatization and its anatomical variant types. Retrospectively evaluated high-resolution computed tomography images of 170 individuals; were studied by ITK-SNAP software to measure the volume of SS. The average volume of SS was a significant difference between the gender, the volume of SS in the elderly group (≥65 years old) showed a downward trend. The volume of the SS in the variants of the anterior clinoid processes, pterygoid processes, greater wings, and clivus were significantly higher than in the nonvariants (P < 0.05). With the expansion of pneumatization, the optic nerve (CNII) type 3-4, the internal carotid artery (ICA) type 2-3 and the septal insertion on the ICA have a larger volume, while the occurrence of septal insertion on only the CNII was not correlated with the volume (P > 0.05). The volume of SS is closely related to age, sex, the type of pneumatization and anatomical variation. High-resolution computed tomography can facilitate a precise study of anatomical variations and adjacent structures and help ensure the safety of an operation.

The pneumatization of the sphenoid sinus, its variations and relations with surrounding neurovascular anatomic structures: A computerized tomography study

Introduction and objectivesThe wide range of variability of SS pneumatization and relation with surrounding structures can result in serious complications; seeing that, the assessment of regional anatomy is essential for both surgeons and radiologists. We mainly aim to reveal the possible correlation between the SS pneumatization types and protrusion/dehiscence of the adjacent neurovascular structures in a larger population by using computerized tomography (CT) images. MethodsThe type of SS pneumatization (I–IV), pneumatization of anterior clinoid process (ACP), greater wing of sphenoid (GWS), and pterygoid process (PP) was evaluated. Protrusion and dehiscence of ICA, ON, MN, and VN was noted. Results1003 patients were included into the study. ICA, ON, and MN protrusions were not seen in patients with the type I or II SS on both sides. These protrusions were most frequently seen along with the type IV SS on both sides (p < 0.05). ICA, ON, MN, and VN dehiscence was not found in any patients with the type I SS. The rate of ICA protrusion increased with presence of GWS and PP; ICA dehiscence was found to be positively correlated with ACP, GWS, and PP pneumatization. ConclusionsVariations, either amount or the extent, of the pneumatization of the SS are related with the presence of protrusion/dehiscence of ICA, ON, MN and VN. Knowing and reporting these relations can decrease the rate of complications during skull base surgery.

NEUROIMAGING DATA OF THE STUDY OF THE CHIASMAL-SELLAR REGION STRUCTURES

NEUROIMAGING DATA OF THE STUDY OF THE CHIASMAL-SELLAR REGION STRUCTURES

Research Status and Prospect of Residual Plastic Film Pickup Mechanism in China

Plastic film mulching technology not only improves the yield, but also brings white pollution. In order to solve the problem of residual film recovery, a large number of plastic film collecting machines have been designed in China. The film picking mechanism is the key part of the residual film recovery machine. Its mechanism form and operation quality play an important role in improving the recovery rate of the residual film. This paper analyzes the development status of the film collecting mechanism of the residual film recycling machine at home and abroad, briefly introduces the structure and working principle of seven kinds of residual film collecting mechanisms, including Winding type, telescopic rod type, elastic tooth type, gear teeth type, drum type and pneumatic type. This study provides relevant suggestions for the optimization and improvement of the film collecting mechanism in the future.

Endoscopic endonasal reconstruction of skull base defects in the lateral recess of the sphenoid sinus: evaluation of computed tomograms for planning operations

Determine the influence of the anatomical features and sizes of the lateral pocket with a defect on the choice of surgical access and the quality of the performed plastics. A retrospective analysis of computed tomograms of 38 patients who underwent surgical treatment at the Burdenko National Medical Research Center for Neurosurgery of the Ministry of Health of Russia about defects of the skull base in the area of the lateral pocket of the sphenoid sinus. The patients were divided into three groups depending on the approach used (the 1st group), the recurrence rate (the 2nd group), and the characteristics of intraoperative visualization of the defect (the 3rd group). There were no statistically significant differences in anatomical features in patients who underwent trans-pterygoid and transsphenoidal approaches, as well as in patients of the 2nd group. Patients of the 3rd group (with visualization features) showed statistically significant differences between the distance from the defect to the VR line (p=0.007). In patients with good visualization of the defect using direct optics, this distance was shorter than in patients in whom the defect was visualized with an angled endoscope. No other anatomical differences were noted. The anatomical features of the lateral pocket structure (type of pneumatization, size and volume) did not affect the choice of access to the defect and the frequency of recurrence. When comparing the approaches, it was noted that the trans-pterygoid access, providing direct visualization of defects, minimizes the risk of recurrence in the postoperative period. An objective anatomical indicator for choosing an access to the defects of the lateral pocket can be the distance from the defect to the VR line: at a distance of more than 0.7 cm, it is advisable to perform a trans-pterygoid approach; at a distance of less than 0.7 cm, it is possible to achieve direct visualization of the defect and perform high-quality plastic surgery with a transsphenoidal access.