[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-458913-105":59,"doc-detail-458913-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","laparoscopic-excision-of-a-psoas-epidermoid-cyst-a-report-of-a-rare-case","Laparoscopic Excision of a Psoas Epidermoid Cyst - A Report of a Rare Case","","Retroperitoneal cysts are uncommon, and retroperitoneal epidermoid cysts are even rarer, often producing nonspecific clinical presentations. The report describes a 41-year-old man with dysuria and bilateral loin pain initially managed as bilateral ureteric calculi after abdominal X-ray findings. After symptom recurrence, imaging showed a large right psoas mass with a provisional hydatid cyst impression. Complete laparoscopic excision and histopathology confirmed a benign epidermoid cyst, highlighting diagnostic difficulty and the therapeutic value of multimodal evaluation and total surgical removal with minimal recurrence.",{"@graph":69,"@context":123},[70,84,106],{"@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/laparoscopic-excision-of-a-psoas-epidermoid-cyst-a-report-of-a-rare-case/458913/",{"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/laparoscopic-excision-of-a-psoas-epidermoid-cyst-a-report-of-a-rare-case/458913.png","ImageObject",300,407,{"name":92,"@type":93},"Indoniesian Boy","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"Why are retroperitoneal epidermoid cysts considered difficult to diagnose?","Question",{"text":113,"@type":114},"They are rare and commonly present with vague, nonspecific symptoms, overlapping with multiple plausible conditions on imaging and clinical review.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What were the key steps that clarified the diagnosis in this case?",{"text":118,"@type":114},"The patient’s symptoms recurred, further imaging suggested a hydatid cyst, and definitive histopathology after complete laparoscopic excision confirmed a benign epidermoid cyst.",{"name":120,"@type":111,"acceptedAnswer":121},"What role does multimodal evaluation and complete surgical excision play?",{"text":122,"@type":114},"A multimodal workup helps manage diagnostic overlap, and complete laparoscopic excision is therapeutically vital, with a minimal recurrence rate reported.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},458913,1791167026,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},962090760608,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Review began 11/18/2025  \nReview ended 12/04/2025  \nPublished 12/09/2025  \n© Copyright 2025  \nDar et al. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0. , which permits unrestricted use , distribution , and reproduction in any medium , provided the original author and source are credited.  \nDOI: 10.7759/cureus.98810  \nOpen Access Case Report  \nLaparoscopic Excision of a Psoas Epidermoid Cyst: A Report of a Rare Case  \nFiza M. Dar 1, Simon Hakobyan 2, Amirah I. Bhatti 3 , Manzoor A. Dar 4  \n1. Cardiology, University Hospitals Coventry and Warwickshire, Coventry, GBR 2. Accident and Emergency, St John 's Hospital, Livingston, GBR 3. Palliative Care, Royal Berkshire Hospital, Reading, GBR 4. General Surgery, Saada Hospital, Sohar, OMN  \nCorresponding author: Fiza M. Dar, [fizamdar@gmail.com](fizamdar@gmail.com)  \nAbstract  \nRetroperitoneal cysts are rare, and retroperitoneal epidermoid cysts are fewer in number; these cysts often pose challenges in being diagnostically vague. This report presents a case of a 41-year-old man who presented with dysuria and bilateral loin pain, and was treated for bilateral ureteric calculi shown on an abdominal X-ray. The patient re-presented with pain, and further imaging revealed a provisional diagnosis of a hydatid cyst, demonstrated by a large mass within the right psoas muscle. Histopathology after a complete laparoscopic excision confirmed a benign epidermoid cyst (Gonzalez-Crussi grade 0) . This case demonstrates that retroperitoneal cysts pose a diagnostic challenge due to vague symptoms and multiple plausible differential diagnoses. A multimodal evaluation and complete surgical excision have proven to be therapeutically vital, with a minimal rate of recurrence.  \nCategories: General Surgery  \nKeywords: epidermoid cyst, epidermoid psoas cyst, gharbi, gonzalez-crussi, hydatid cyst, laparoscopy, retroperitoneal cyst  \nIntroduction  \nRetroperitoneal cysts are rare, with retroperitoneal epidermoid cysts accounting for less than 1% among these, and cysts in the psoas compartment more infrequent [1] . Histologically, epidermoid cysts are keratinfilled and lined by stratified squamous epithelium [2] with no skin that distinguishes them from dermoid cysts. The origin of these cysts is still unclear; however, there are theories of abnormal sequestration in the retroperitoneal space during embryological development or of them being acquired or traumatic. However, this is more likely for other body parts, such as cysts on the skin [3] . Patients are typically asymptomatic, and the cyst is an incidental finding, or patients may present with vague symptoms such as abdominal pain and distension from a mass effect [4] .  \nDifferential diagnoses include hydatid cysts (mimic epidermoid cysts as well-circumscribed unilocular cysts), abscesses (or a psoas abscess in this case due to thick enhancing walls and surrounding inflammation), germ cell tumors (as both may contain keratinaceous debris and squamous epithelium) [4], and mucinous cystic neoplasms (also unilocular cysts) ; these overlaps and similarities warrant a multimodal approach with appropriate imaging, serology, surgery, and histopathology. Surgery and histopathological examination of the lesion remain the gold standard for diagnosis and treatment. Due to the lack of literature, the vague nature of symptoms, and the range of mimicked conditions, a diagnostic and curative challenge is faced [5] . This case report presents a rare case of a complete laparoscopic excision of a psoas epidermoid cystand is one of the only cases reported in English literature. It highlights the importance of a multimodal approach, careful and complete surgical excision, and histological diagnosis in successful treatment.  \nCase Presentation  \nA 41-year-old man with a past medical history of hypertension and polyuria presented to the emergency department with bilateral flank pain and dysuria. An abdominal X-","cbCaimqqRNZpFw50","https://ap.wps.com/l/cbCaimqqRNZpFw50","pdf",4575996,"English","# Abstract\n# Introduction\n# Case Presentation\n## Initial Presentation and Investigations\n## Imaging and Provisional Diagnosis\n## Pre-operative Laboratory Findings","[{\"question\":\"Why are retroperitoneal epidermoid cysts considered difficult to diagnose?\",\"answer\":\"They are rare and commonly present with vague, nonspecific symptoms, overlapping with multiple plausible conditions on imaging and clinical review.\"},{\"question\":\"What were the key steps that clarified the diagnosis in this case?\",\"answer\":\"The patient’s symptoms recurred, further imaging suggested a hydatid cyst, and definitive histopathology after complete laparoscopic excision confirmed a benign epidermoid cyst.\"},{\"question\":\"What role does multimodal evaluation and complete surgical excision play?\",\"answer\":\"A multimodal workup helps manage diagnostic overlap, and complete laparoscopic excision is therapeutically vital, with a minimal recurrence rate reported.\"}]","Laparoscopic Excision of a Psoas Epidermoid Cyst - A Report of a Rare Case | PDF",1790754741,23]