Cystic Lesions Of Liver Research Articles

Role of Magnetic Resonance Elastography in Assessment of Hepatic Focal Lesions

Abstract Background Hepatic focal lesions have been a common reason for consultation faced by gastroenterologists and hepatologists. It is important to consider not only malignant liver lesions, but also benign solid and cystic liver lesions. Objective to evaluate and confirm the role of magnetic resonant elastography in assessment of the hepatic focal lesions and differentiate benign from malignant hepatic focal lesions. Patients and Methods This is a cross sectional study included 30 patients with variety of focal lesions identified either by dynamic MRI or by histopathology. Results Our study showed that a cut off value of 4 Kpa had a 90% sensitivity, 85.7% specificity, 95% positive predictive value, 75% negative predictive value and accuracy 90 %. Conclusion MRE showed a great potential as a promising non invasive technique for quantitative evaluation of hepatic masses that could introduce more data useful in characterization of the focal lesions.

Case series multilocular cystic hemangioma of the liver: Three cases and literature review.

Multilocular cystic hemangioma is a rare benign tumor classified as an atypical hemangioma. Currently, there are limited imaging reports available, and the imaging characteristics can be challenging to distinguish from other malignant multilocular cystic liver diseases such as cystadenocarcinoma, necessitating confirmation through pathological diagnosis. Here, we discuss the imaging features of 3 cases of multilocular cystic hemangiomas. Case 1 was a 24-year-old young female, and Case 2 involved a 60-year-old elderly male. Both patients were asymptomatic and physical examination revealed hepatic space-occupying lesions. Imaging findings revealed multilocular cystic lesions in the left liver with septa, calcification, a high diffusion-weighted magnetic resonance imaging (DWI) signal at the edge of the lesion, and progressive enhancement of the cyst wall and septa. Case 3 involved a 50-year-old male patient with epigastric distending pain for 1 month and sudden severe abdominal pain for 14 hours. Imaging results revealed a multilocular cystic lesion in the left liver with septa and tumor bleeding, a high DWI signal, and an enhanced cyst wall and septa. The pathological diagnosis confirmed a hepatic hemangioma. All 3 patients underwent liver tumor resection. All 3 patients recovered successfully without any intraoperative or postoperative complications during the follow-up periods of 5 years, 6 months, and 5 months. There were no signs of recurrence. Liver imaging revealed multilocular cystic lesions with features, such as compartmentalization, calcification, or bleeding. Multilocular cystic hemangiomas should be considered in imaging diagnosis. Enhancing our understanding of multilocular cystic hemangiomas can aid in improving the differential diagnosis of other malignant multilocular cystic liver diseases, ultimately reducing unnecessary liver resection.

Diagnosis and treatment experience of atypical hepatic cystic echinococcosis type 1 at a tertiary center in China.

Some hydatid cysts of cystic echinococcosis type 1 (CE1) lack well-defined cyst walls or distinctive endocysts, making them difficult to differentiate from simple hepatic cysts. To investigate the diagnostic methods for atypical hepatic CE1 and the clinical efficacy of laparoscopic surgeries. The clinical data of 93 patients who had a history of visiting endemic areas of CE and were diagnosed with cystic liver lesions for the first time at the People's Hospital of Xinjiang Uygur Autonomous Region (China) from January 2018 to September 2023 were retrospectively analyzed. Clinical diagnoses were made based on findings from serum immunoglobulin tests for echinococcosis, routine abdominal ultrasound, high-frequency ultrasound, abdominal computed tomography (CT) scan, and laparoscopy. Subsequent to the treatments, these patients underwent reexaminations at the outpatient clinic until October 2023. The evaluations included the diagnostic precision of diverse examinations, the efficacy of surgical approaches, and the incidence of CE recurrence. All 93 patients were diagnosed with simple hepatic cysts by conventional abdominal ultrasound and abdominal CT scan. Among them, 16 patients were preoperatively diagnosed with atypical CE1, and 77 were diagnosed with simple hepatic cysts by high-frequency ultrasound. All the 16 patients preoperatively diagnosed with atypical CE1 underwent laparoscopy, of whom 14 patients were intraoperatively confirmed to have CE1, which was consistent with the postoperative pathological diagnosis, one patient was diagnosed with a mesothelial cyst of the liver, and the other was diagnosed with a hepatic cyst combined with local infection. Among the 77 patients who were preoperatively diagnosed with simple hepatic cysts, 4 received aspiration sclerotherapy of hepatic cysts, and 19 received laparoscopic fenestration. These patients were intraoperatively diagnosed with simple hepatic cysts. During the follow-up period, none of the 14 patients with CE1 experienced recurrence or implantation of hydatid scolices. One of the 77 patients was finally confirmed to have CE complicated with implantation to the right intercostal space. Abdominal high-frequency ultrasound can detect CE1 hydatid cysts. The laparoscopic technique serves as a more effective diagnostic and therapeutic tool for CE.

Complex cystic liver lesions: classification, diagnosis, and management.

Cystic liver disease has been increasingly reported in the literature, with a prevalence as high as 15-18%. Hepatic cysts are usually discovered incidentally, while their characterization and classification rely on improved imaging modalities. Complex cystic liver lesions comprise a wide variety of novel, re-introduced, and re-classified clinical entities. This spectrum of disorders ranges from non-neoplastic conditions to benign and malignant tumors. Their clinicopathological features, prognostic factors, and oncogenic pathways are incompletely understood. Despite representing a heterogeneous group of disorders, they can have similar clinical and imaging characteristics. As a result, the diagnosis and management of complex liver cysts can become quite challenging. Furthermore, inappropriate diagnosis and management can lead to high morbidity and mortality. In this review, we aim to offer up-to-date insight into the diagnosis, classification, and management of the most common complex cystic liver lesions.

Case Report: Primary Liver Mature Teratoma in Childhood

We present the case of a male 2-year-old patient who underwent surgery for a 13-cm-long liver teratoma that caused elongation of the common hepatic duct and the portal vein. The boy had an abdominal mass and abdominal distension with pain of mild intensity. Abdominal computed tomography and abdominal nuclear magnetic resonance reported a predominantly cystic expansive liver lesion with some internal solid components. The case was evaluated and surgical intervention was decided, performing a right hepatectomy and biliodigestive derivation due to elongation and compromise of the common bile duct. Primary mature liver teratoma is a rare tumor in population with a higher incidence in children, so it should be suspected in all patients with solid liver tumors that do not present with high AFP values.

External validation of a machine learning based algorithm to differentiate hepatic mucinous cystic neoplasms from benign hepatic cysts.

To externally validate an algorithm for non-invasive differentiation of hepatic mucinous cystic neoplasms (MCN) from benign hepatic cysts (BHC), which differ in management. Patients with cystic liver lesions pathologically confirmed as MCN or BHC between January 2005 and March 2022 from multiple institutions were retrospectively included. Five readers (2 radiologists, 3 non-radiologist physicians) independently reviewed contrast-enhanced CT or MRI examinations before tissue sampling and applied the 3-feature classification algorithm described by Hardie et al. to differentiate between MCN and BHC, which had a reported accuracy of 93.5%. The classification was then compared to the pathology results. Interreader agreement between readers across different levels of experience was evaluated with Fleiss' Kappa. The final cohort included 159 patients, median age of 62years (IQR [52.0, 70.0]), 66.7% female (106). Of all patients, 89.3% (142) had BHC, and the remaining 10.7% (17) had MCN on pathology. Agreement for class designation between the radiologists was almost perfect (Fleiss' Kappa 0.840, p < 0.001). The algorithm had an accuracy of 98.1% (95% CI [94.6%, 99.6%]), a positive predictive value of 100.0% (95% CI [76.8%, 100.0%]), a negative predictive value of 97.9% (95% CI [94.1%, 99.6%]), and an area under the receiver operator characteristic curve (AUC) of 0.911 (95% CI [0.818, 1.000]). The evaluated algorithm showed similarly high diagnostic accuracy in our external, multi-institutional validation cohort. This 3-feature algorithm is easily and rapidly applied and its features are reproducible among radiologists, showing promise as a clinical decision support tool.

СОВРЕМЕННЫЕ АСПЕКТЫ НЕПАРАЗИТАРНЫХ КИСТ ПЕЧЕНИ

Methods: The relevance of nonparasitic cysts of the liver (NPCL) is related to their steadily increasing incidence, high recurrence rates, delayed diagnosis, and potential complications. In general, hepatic cysts (HCs) are classified into several types, including simple and complex, false and true. Simple cysts are mainly congenital but also occur in polycystic liver disease. Complex cysts include mucinous neoplasms, echinococcal cysts, hemorrhagic cysts, cystic hepatocellular carcinoma, and other rare lesions. Nonparasitic cystic liver lesions do not usually cause symptoms, and their characteristics are not specific. In 15% of cases, nonspecific signs (flatulence, nausea, dyspepsia) accompany pain. Diagnosis of NPCL is based on data from ultrasound, CT, or MRI of the abdominal organs. There still needs to be a consensus on surgical treatment indications or the effectiveness and feasibility of its various methods. Many surgical interventions for NPCL treatment include puncture drainage, multiple minimally invasive (laparoscopic) surgery options, and open methods. In clinical practice, laparoscopic fenestration, associated with fewer complications and faster recovery, has become widespread. However, significant progress has yet to be achieved in reducing NPCL recurrence rates despite advances in surgical treatment. Therefore, multiple studies are underway to improve treatment options for this medical condition. Keywords: Liver, cyst, nonparasitic cyst, pseudocyst, laparoscopic fenestration.

A CASE REPORT OF VON MEYENBURG COMPLEXES

Background: The von Meyenburg complexes (VMC) are a rare clinicopathological entity. They are usually asymptomatic and are presented as multiple small-sized cystic liver lesions. Ultrasonography, CT and MRI are used for diagnosis. Case report: A 74-years old female patient with previous oncologic surgeries was admitted to our department with clinical, laboratory and imaging findings of acute cholecystitis and cystic lesions in the liver. A laparoscopic cholecystectomy with liver biopsy was performed. Liver histology revealed bile duct hamartomas (von Meyenburg complexes). Conclusion: VMC represent a diagnostic problem in patients with oncologic history because they are difficult to be distinguished from liver metastases.

Case Report of a 45-year-Old Female Patient with a Large Cystic Liver Lesion with Imaging Features of Hydatid Cyst, which Was Found to Be Cystadenocarcinoma. A Challenge

Case Report of a 45-year-Old Female Patient with a Large Cystic Liver Lesion with Imaging Features of Hydatid Cyst, which Was Found to Be Cystadenocarcinoma. A Challenge

Giant Cyst of Müllerian Origin Presenting as a Primary Cystic Liver Lesion

Giant Cyst of Müllerian Origin Presenting as a Primary Cystic Liver Lesion

Diagnostic and Treatment Errors in Biliary Cystadenomas and Cystadenocarcinomas: Clinical Cases

Background. Biliary cystadenomas and cystadenocarcinomas are rare cystic tumors of the liver. Complicated differential diagnostics for simple cysts often leads to errors in surveillance of patients with these tumors. Cystadenoma and cystadenocarcinoma should be suspected upon detection of single or multilocular cystic neoplasms of the liver with septa and blood flow loci in the cyst wall, especially in middle-aged women. The localization of the tumor is critical. The most common localization is segment IV of the liver. Urgent intraoperative biopsy is required to determine the extent of surgery.Case description. Clinical observations with analysis of the examination and treatment data of two female patients aged 38 and 56 were presented. Both clinical observations illustrate the underestimation of the preoperative examination data that served as a ground for diagnosis of liver cysts with inadequate extent of surgery. In the first case, the resection was incomplete, and, as such, the biliary cystadenoma recurred in the resection area, the capsule of the neoplasm was ruptured and an encysted fluid collection was formed. In the second case, lack of histological examination of the excised neoplasm, due to confidence in its morphological verification as a cyst, resulted in cystadenoma recurrence in the resection zone with metastasis to the contralateral lobe of the liver.Conclusion. Hepatic cystadenomas and cystadenocarcinomas are often misdiagnosed as simple cysts. These tumors should be suspected in central localization of the tumor in the liver, especially in young women. The clinical and instrumental symptomatology and radiological semiotics of the disease require careful evaluation. The recurrence of a cystic lesion in the resection zone in a patient previously operated for a hepatic cyst serves as an additional signal for detecting biliary cystadenoma. Rational strategy for surgical management of cystic liver lesions should include hepatectomy within healthy tissues (both anatomical and atypical) with mandatory intraoperative ultrasound and urgent histological examinations.

HPB P34 Complexity alone is not an indication for resection of liver cysts

Abstract Background Most cystic liver lesions are simple biliary cysts (SBC) and have no malignant potential. Surgical deroofing may be indicated if symptomatic. Mucinous cystic neoplasms (MCN) represent less than 5% of liver cysts but can progress to mucinous cystadenocarcinoma and therefore require formal liver resection. While an MCN would demonstrate complex features on imaging, SBC may have similar appearances following episodes of infection or bleeding. CT, MR and US scans therefore have low positive predictive value for MCN, and most complex cystic liver lesions represent SBC. As a result, the decision to resect a complex cyst can be difficult for both patients and clinicians. We aimed to review our practice. Methods Patients treated surgically for cystic liver lesions in a tertiary Hepatobiliary (HPB) centre between 2016 and 2019 were identified. Data on preoperative imaging, patient demographics, histology and follow up were obtained retrospectively. Results 18 patients were treated surgically for liver cysts. Cysts were solitary in 3/18 cases. Eight were classified as complex on preoperative radiology. Five (all were complex and one was solitary) underwent formal liver resection and the remaining 13 were deroofing procedures. Patients who underwent liver resection were significantly more likely to have an asymptomatic liver cyst (4/5 vs 0/13, chi Squared, p&amp;lt;0.01). None of the resected specimens represented MCN, and complex characteristics on imaging were attributed to episodes of bleeding or infection. 14/18 patients were followed up for a median of 9 months (range: 2–36) without major adverse events. Conclusions Surgical risks of liver resection must be balanced against likelihood of future malignancy. Cyst complexity alone is not an indication for resection and selected cases can be fenestrated if there are no other features to strongly suggest MCN, such as being solitary or in the absence of history suggesting cyst haemorrhage or infection

S3022 Hepatic Cerebrospinal Fluid Pseudocyst: A Rare Complication of Ventriculoperitoneal Shunt

Introduction: Ventriculoperitoneal shunts (VPS) are commonly used in the management of hydrocephalus to drain cerebrospinal fluid (CSF) into the peritoneal cavity. The placement of VPS has prolonged the survival of patients with hydrocephalus. Abdominal pseudocysts are long-term complication of VPS that are identified later in life. Hepatic CSF pseudocyst is a rare long-term complication of VPS that should be differentiated from other cystic lesions of liver. Case Description/Methods: A 49-year-old man with intellectual disability from congenital hydrocephalus s/p placement of right and left-sided VPS at age of 3 months and 7 years respectively presented with exertional dyspnea and abdominal distension. On presentation his vitals were unremarkable except tachycardic (115/min)., He had abdominal distention, hepatomegaly but no tenderness. Initial labs showed D-dimer 2.20 mcg/mL, AST 27 u/L, ALT 38 u/L, alkaline phosphate 126 u/L and total bilirubin 0.5 mg/dL. Chest CT with IV contrast was negative for pulmonary embolism, however revealed a large 18x13x13.5 cm cyst in right hepatic lobe. CT abdomen and pelvis demonstrated a 17.5x12.6x12.7 cm cystic lesion in the right hepatic lobe with the tip of VP shunt catheter within cyst cavity. Hepatobiliary nuclear scan was unremarkable for any biliary leak or sphincter of oddi dysfunction. CT head was negative for any acute abnormalities. Shunt series x-rays were negative for disruption of VPS catheter. Robotic laparoscopic cyst fenestration with partial hepatectomy was performed and catheter was repositioned to the right lower quadrant of abdomen. Patient was discharged home two days later with significant reduction of cyst size on follow up imaging. (Figure) Discussion: This case illustrates a rare complication of VPS that result in hepatic CSF pseudocyst. If hydrocephalus is absent, patients with hepatic CSF pseudocyst are asymptomatic at earlier stages., or they may present with abdominal pain, distention, or palpable right upper quadrant abdominal mass. A subset of patients with hepatic CSF pseudocyst are complicated with bacterial or parasitic infection and present with abdominal pain, distention, or right upper quadrant mass. Abdominal ultrasound and CT scan assist in diagnosis by identifying the tip of VPS catheter in the pseudocyst cavity. Asymptomatic patients are managed conservatively while surgical repositioning of VPS catheter with or without cyst fenestration or surgical excision of cyst may be required for complete resolution of symptoms.Figure 1.: CT of abdomen showing a large right hepatic lobe cyst with evidence of tip of right VPS catheter within the cavity of the cyst (arrows) on transverse (A), axial (B) and lateral (C) views. CT scan of the head (D) showing VPS catheters both in right and left lateral ventricles without evidence of ventricular dilation. Shunt series x-ray (E) shows now distortion of VPS catheter. Robotic laparoscopic cyst fenestration (F) shows VPS catheter within cyst cavity containing CSF.

S3101 When a Cyst Isn't Just a Cyst: A Rare Case of a Hydatid Liver Cyst Caused by Echinococcus in the United States

Introduction: Echinococcus Granulosus is a parasite that causes hydatid disease. It is endemic to many countries but is rarely seen in the US, particularly in the Northeast. We present a case of a 22-year-old American male with a hydatid liver cyst due to an Echinococcus infection. Case Description/Methods: 22-year-old obese male presented to a local hospital for RUQ abdominal pain that radiated throughout his abdomen. He denied recent diet changes, travel or sick contacts.On presentation the patient had leukocytosis, transaminitis, hyperbilirubinemia and an elevated alkaline phosphatase. CT abdomen showed mild splenomegaly and a new 8.6cm diameter heterogeneous low density poorly enhancing mass in the right hepatic lobe. RUQ US revealed a heterogeneous irregularly marginated hypoechoic 9.6 × 9.5 × 5.7 cm soft tissue liver mass. Abdominal MRI showed a 9.3 × 7.3 cm complex, cystic and multilobulated lesion with thick walls and internal septations in the right hepatic lobe. He was transferred to our hospital for GI evaluation, where an US guided aspiration of the collection was recommended. 5 ccs of purulent aspirate were drained, sent for culture and a hepatic drain was placed. There was no evidence of malignancy in the aspirate. He then shared that over a year before his presentation, he served 9 months in Afghanistan with the US military. An infectious workup then showed serum positive for echinococcus antibody. Treatment was started with daily oral albendazole for Cystic Echinococcus (CE). Eight and half weeks later his pain had resolved and interval improvement with decreased abscess size was seen on CT (Figure 1). Discussion: CE is common in South America, the Middle East, Africa and Asia. Most cases of CE in the US are found in immigrants from endemic countries. Local transmission has been reported in California, Alaska and the southwest US. Our case of an American male with CE highlights the importance of understanding the lifecycle of CE as there is often many years between ingestion of eggs and symptom onset. It also demonstrates the importance of obtaining enzyme-linked immunosorbent assay test for Echinococcus, which is 90% sensitive, prior to considering surgery for a cystic liver lesion. Rupture of hydatid cysts occurs spontaneously or during surgery and can cause multifocal dissemination leading to fever, urticaria, eosinophilia or anaphylaxis. If physicians are familiar with pathology endemic to different countries, patients will be more likely to receive timely, appropriate care.Figure 1.: A. CT abdomen completed at time of presentation demonstrating heterogenous low density and poorly enhancing mass. B. MRI abdomen completed at time of presentation showing complex cystic and multilobulated lesion with thick walls and thick internal septations. C. CT abdomen eight and half weeks after initiation of Albendazole.

S1741 Gelatinous Ascites and a Double Duct Sign: A Case of Pancreatic Adenocarcinoma

Introduction: Pseudomyxoma peritonei (PMP) is a rare disorder characterized by the accumulation of gelatinous material within the abdomen and pelvis. While usually appendiceal in origin, it can be seen with mucinous tumors arising from the ovary, GI tract, urachus, and pancreas. We describe a case of pancreatic adenocarcinoma diagnosed due to the clinical syndrome precipitated by pseudomyxoma peritonei. Case Description/Methods: A 59-year-old Hispanic male presented to the hospital for evaluation due to a 2 month history of poor oral intake and worsening abdominal fullness, distension, discomfort, and intermittent pain. The patient reported one prior hospitalization for pancreatitis of unclear etiology, 3 years ago. A CT abdomen & pelvis was obtained; findings reported include multiple hepatic subcapsular cystic liver lesions, abdominal omental caking, ascites, and extrahepatic biliary and pancreatic ductal dilatation without definitive evidence of a mass. CEA and CA 19-9 were found to be elevated at 49.4 and 416 respectively. CT chest revealed a left-sided pleural effusion. Upper endoscopy and colonoscopy were negative. Paracentesis yielded gelatinous ascites. Clinical suspicion for appendiceal malignancy was raised which required surgical exploration and biopsy to confirm. An MRI of the abdomen was obtained to assess for pancreatic mass given presence of double duct sign. MRI revealed 2.2 x 2.7 x 5 cm lesion in the body of the pancreas, pseudomyxoma peritonei with scalloping of the liver and extension into the right posterior mediastinum via the esophageal hiatus, metastatic deposits in the porta hepatis and peritoneal carcinomatosis. No apparent abnormality in the appendix was observed. EUS FNA was performed; splenic vessel invasion by the mass was noted. Cytopathology supported a diagnosis of pancreatic adenocarcinoma. The patient was initiated on palliative chemotherapy with gemcitabine and nab-paclitaxel which led to a significant reduction in ascites and pleural effusion and improvement in symptoms. Discussion: This case highlights the potential of malignancies such as pancreatic adenocarcinoma to cause pseudomyxoma peritonei despite it more commonly being associated with appendiceal origin. Knowledge of this can help guide diagnostic and therapeutic plans.

Budd-Chiari-like pathology in dolphins

Nearly two decades ago, pathologic examination results suggested that acoustic factors, such as mid-frequency active naval military sonar (MFAS) could be the cause of acute decompression-like sickness in stranded beaked whales. Acute systemic gas embolism in these whales was reported together with enigmatic cystic liver lesions (CLL), characterized by intrahepatic encapsulated gas-filled cysts, tentatively interpreted as “gas-bubble” lesions in various other cetacean species. Here we provide a pathologic reinterpretation of CLL in odontocetes. Among 1,200 cetaceans necropsied, CLL were only observed in four striped dolphins (Stenella coeruleoalba), with a low prevalence (2%, N = 179). Together, our data strongly suggest that CLL are the result of the combination of a pre-existing or concomitant hepatic vascular disorder superimposed and exacerbated by gas bubbles, and clearly differ from acute systemic gas embolism in stranded beaked whales that is linked to MFAS. Budd-Chiari-like syndrome in dolphins is hypothesized based on the present pathologic findings. Nonetheless, further researched is warranted to determine precise etiopathogenesis(es) and contributing factors for CLL in cetaceans.

Deletion of kif3a in CK19 positive cells leads to primary cilia loss, biliary cell proliferation and cystic liver lesions in TAA-treated mice.

Loss of primary cilia in epithelial cells is known to cause cystic diseases of the liver and kidney. We have previously shown that during experimental and human cirrhosis that primary cilia were predominantly expressed on biliary cells in the ductular reaction. However, the role of primary cilia in the pathogenesis of the ductular reaction is not fully understood. Primary cilia were specifically removed in biliary epithelial cells (BECs) by the administration of tamoxifen to Kif3af/f;CK19CreERT mice at week 2 of a 20-week course of TAA treatment. Biliary progenitor cells were isolated and grown as organoids from gallbladders. Cells and tissue were analysed using histology, immunohistochemistry and Western blot assays. At the end of 20weeks TAA administration, primary cilia loss in liver BECs resulted in multiple microscopic cystic lesions within an unaltered ductular reaction. These were not seen in control mice who did not receive TAA. There was no effect of biliary primary cilia loss on the development of cirrhosis. Increased cellular proliferation was seen within the cystic structures associated with a decrease in hepatocyte lobular proliferation. Loss of primary cilia within biliary organoids was initially associated with reduced cell passage survival but this inhibitory effect was diminished in later passages. ERK but not WNT signalling was enhanced in primary cilia loss-induced cystic lesions in vivo and its inhibition reduced the expansion of primary cilia deficient biliary progenitor cells in vitro. TAA-treated kif3a BEC-specific knockout mice had an unaltered progression to cirrhosis, but developed cystic lesions that showed increased proliferation.

Differentiation of mucinous cysts and simple cysts of the liver using preoperative imaging.

Preoperative radiographic differentiation of mucinous cystic neoplasms (MCN) and simple cysts (SLC) of the liver is challenging. Previous data have demonstrated that the finding of septations arising from the cyst wall without indentation on cross-sectional imaging is associated with MCN. We aim to assess whether this radiographic feature is diagnostic of MCN. A prospectively maintained database was queried for patients with a preoperative diagnosis of a cystic liver lesion who subsequently underwent operative intervention. The feature of septations without indentation of the cyst wall was evaluated on cross-sectional imaging obtained within 3months of operation. Imaging was independently evaluated by three radiologists blinded to pathology and interobserver agreement was compared to assess the diagnostic accuracy of this feature as well as the overall likelihood of the lesion representing a MCN. There were 95 patients who met inclusion criteria; 80 (84%) had SLC on pathology, while 15 (16%) had MCN. Presence of septa without indentation of cyst wall had high sensitivity (range 80-87%), but low specificity (range 48-66%). Interobserver percent agreement (PA) was 51% [κ = 0.35 (95% CI 0.22-0.47)]. Sensitivity among the three radiologists ranged between 20 and 80% and specificity between 71 and 91% for the likelihood of the lesion representing MCN versus SLC, with an area under the curve (AUC) of 0.67-0.79; however, interobserver agreement was fair [κ = 0.40 (95% CI 0.25-0.55), PA = 67%]. The presence of septations without indentation of cyst wall demonstrates adequate sensitivity to differentiate MCN and SLC. However, there is variability for detection of this feature and therefore, it alone is of limited clinical value.

Predictive Factors for Preoperative Diagnosis and Management of Cystic Liver Lesions: A Six Years Single Centre Experience

Introduction: Surgical management differs for different cystic lesions of liver. Various clinical, biochemical and radiological features are specific to a particular cystic liver lesion pathology and it’s associated complications. Preoperative diagnosis helps to select appropriate surgical approach and tailoring appropriate management. Aim: To evaluate the clinical, biochemical, radiological predictive factors to differentiate between hydatid diseases, simple cyst of liver and biliary cystadenoma. Also to evaluate appropriate management for hydatid disease with cystobiliary communication. Materials and Methods: A retrospective study was conducted at Institute of Surgical Gastroenterology, Madras Medical College, Chennai, Tamil Nadu, India. Data were collected from 65 patients including 44 patients of hydatid disease, 13 patients of simple cyst, and 8 patients of biliary cystadenoma using a maintained database from January 2014 to December 2019 with a follow up period up to December 2020 (mean follow up of 47.06±24.37 months). Various parameters like presence of cholangitis, deranged liver function test, number of cystic lesion, presence of calcification, presence of septation with or without enhancement were assessed. Data were statistically analysed using Analysis of Variance (ANOVA) and Chi-square test. Results: There were 44 (67.69%) females and 21 (32.31%) males in this study with mean age of 50.44±12.23 years. Though multiseptation was associated with 27 (61.36%) of hydatid cysts and 1 (7.69%) of atypical simple cyst, it was more specifically present in biliary cystadenoma 8 (100%). Presence of daughter cyst (n=24, 54.55%) in hydatid disease and multilobulated appearance (n=5, 62.5%) in biliary cystadenoma were strong predictors of diagnosis. Radical surgery was associated with significantly less postoperative bile leak than conservative surgery in patients of hydatid disease with cystobiliary communication. Conclusion: Predictive factors can help to make preoperative diagnosis correctly. Radical surgery reduces postoperative bile leak in patients of hydatid disease with cystobiliary communication.

Diaphragmatic Mesothelial Cyst: Radiological Appearance and Follow-Up Results During Childhood.

To identify radiological findings of diaphragmatic mesothelial cysts (DMC) in the pediatric age group and to assess follow-up outcomes.In this study, 27 pediatric age group patients were evaluated with ultrasonography (US), computed tomography (CT), or magnetic resonance imaging due to various clinical indications and diagnosed with DMC from May 2014 to September 2018. Age, sex, imaging indications and DMC localization, volumes in the first diagnosis, and follow-ups were retrospectively evaluated. Descriptive statistics were used for age, sex, imaging indications, and volume are presented as numbers and percentages.Ages range from 5 months to 13 years. Nine girls and 18 boys included in this study. The most common imaging indications were abdominal pain, diarrhea, and obesity. The mean volume of DMC was at first 2.62 and 2.45 mL during the follow-ups. There was volume reduction in 24 cases, and no change in 3 cases. Mean follow-up duration was 22.4 months. The US imaging findings were similar for all cases, bilobular cystic lesion with fat indentation between the cyst and liver parenchyma.The typical localization and lateral fat sign are useful in differential diagnosis of DMC from cystic lesions of liver. The US is a very effective and beneficial radiological method for diagnosis and follow-up. Routine clinical and sonographic follow-ups may be sufficient for asymptomatic patients with stable cyst volume.