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A 44-year-old woman presented with vertigo and headache for 4 weeks, with left cerebellar dysfunction and a left cerebellopontine angle cystic lesion on MRI. Complete microsurgical excision was performed and histopathology confirmed EC. At 3 months, symptoms resolved and MRI showed no recurrence, emphasizing histology-confirmed diagnosis and long-term follow-up.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/enterogenous-cyst-at-the-cerebellopontine-angle-in-an-adult-the-diagnostic-challenge-in-a-rare-case-report/433445/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/enterogenous-cyst-at-the-cerebellopontine-angle-in-an-adult-the-diagnostic-challenge-in-a-rare-case-report/433445.png","ImageObject",300,407,{"name":92,"@type":93},"pixelkiddo","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":44},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is an enterogenous cyst and why is it difficult to diagnose before surgery?","Question",{"text":112,"@type":113},"Enterogenous cysts are rare benign lesions resembling gastrointestinal or respiratory tissue. Their radiological appearance often mimics other cystic lesions in the posterior fossa, making preoperative diagnosis challenging.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What symptoms and findings were reported in the presented case?",{"text":117,"@type":113},"A 44-year-old woman had vertigo and headache for 4 weeks. Neurological examination showed left-sided cerebellar dysfunction, and MRI demonstrated a left cerebellopontine angle cystic lesion.",{"name":119,"@type":110,"acceptedAnswer":120},"How was the diagnosis confirmed and what was the patient’s outcome after treatment?",{"text":121,"@type":113},"The patient underwent complete microsurgical excision, and histopathology confirmed enterogenous cyst. 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They are more frequently found in the spinal axis than in the intracranial compartment and are believed to arise from endodermal displacement during embryogenesis. With the advancement of neuroimaging, incidental detection has increased, although their radiological appearance often mimics other cystic lesions, making preoperative diagnosis challenging.  \nCase summary: A 44-year-old female presented with vertigo and headache for 4 weeks. Neurological examination revealed leftsided cerebellar dysfunction. Magnetic resonance imaging (MRI) of the brain demonstrated a left cerebellopontine angle cystic lesion. The patient underwent complete microsurgical excision of the lesion, and histopathology confirmed the diagnosis of an EC. At 3 months of follow-up, her symptoms had completely resolved, and MRI showed no evidence of recurrence.  \nClinical discussion: Intracranial ECs are exceptionally rare and may mimic arachnoid, epidermoid, or other cystic pathologies, complicating preoperative diagnosis. Histopathological confirmation remains the gold standard for diagnosis. Complete surgical excision offers the best outcome, although adherence to vital neurovascular structures may limit total resection and increase recurrence risk. Therefore, long-term radiological follow-up is essential, as recurrence can occur years after apparently successful surgery.  \nConclusion: ECs should be considered in the differential diagnosis of posterior fossa cystic lesions. Early identification, accurate diagnosis, and complete excision provide favorable outcomes, while continued follow-up is recommended to detect potential recurrence.  \nKeywords: case report, CP angle tumor, enterogenous cyst  \nIntroduction  \nEnterogenous cysts (ECs) are rare tumors at the cerebellopontine (CP) angle, usually lined by cells of the endodermal lineage[1,2] . Although their exact pathogenesis remains uncertain, it is widely hypothesized that these cysts arise from incomplete resorption of the neurenteric canal during embryonic development[3,4] . Given  \naDepartment of Neurosurgery, Upendra Devkota Memorial National Institute of Neurological and Allied Sciences (UDM-NINAS), Bansbari, Kathmandu and bDepartment of Pathology, Upendra Devkota Memorial National Institute of Neurological and Allied Sciences (UDM-NINAS), Bansbari, Kathmandu Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.  \n*Corresponding author. Address: Department of Neurosurgery, Upendra Devkota Memorial National Institute of Neurological and Allied Sciences (UDM-NINAS), Bansbari, Kathmandu 44600, Nepal. Tel.: +977 986 098 4542.  \n[E-mail: dr.ramprasadsubedi@gmail.com](E-mail: dr.ramprasadsubedi@gmail.com) (R.P. Subedi).  \nCopyright © 2025 The Author(s). Published by Wolters Kluwer Health, Inc. This is an open access article distributed under the Creative Commons AttributionNoDerivatives License 4.0, which allows for redistribution, commercial and noncommercial, as longas it is passed along unchanged and in whole, with credit to the author.  \nAnnals of Medicine & Surgery (2026) 88:824–829  \nReceived 30 August 2025; Accepted 7 November 2025  \nPublished online 24 November 2025  \n[http://dx.doi.org/10.1097/MS9.0000000000004364](http://dx.doi.org/10.1097/MS9.0000000000004364)  \nHIGHLIGHTS  \n● Enterogenous cysts in the cerebellopontine angle region are very rare and often mimic other cystic lesions in the posterior fossa.  \n● Com","cbCaivpblEFHnhlL","https://ap.wps.com/l/cbCaivpblEFHnhlL","pdf",1372225,"English","# Introduction\n# Case summary\n## Presentation\n## Surgical management and outcome\n# Clinical discussion\n# Conclusion\n# Highlights","[{\"question\":\"What is an enterogenous cyst and why is it difficult to diagnose before surgery?\",\"answer\":\"Enterogenous cysts are rare benign lesions resembling gastrointestinal or respiratory tissue. Their radiological appearance often mimics other cystic lesions in the posterior fossa, making preoperative diagnosis challenging.\"},{\"question\":\"What symptoms and findings were reported in the presented case?\",\"answer\":\"A 44-year-old woman had vertigo and headache for 4 weeks. Neurological examination showed left-sided cerebellar dysfunction, and MRI demonstrated a left cerebellopontine angle cystic lesion.\"},{\"question\":\"How was the diagnosis confirmed and what was the patient’s outcome after treatment?\",\"answer\":\"The patient underwent complete microsurgical excision, and histopathology confirmed enterogenous cyst. After 3 months, symptoms completely resolved and MRI showed no evidence of recurrence.\"}]","Enterogenous Cyst at the Cerebellopontine Angle in an Adult - The Diagnostic Challenge in a Rare Case Report | PDF",1790664127,15]