muscular hydatidosis: a rare circumstance (case report)

Background: hydatidosis is a parasitic disease caused by the larvae of the genus echinococcus. hydatidosis commonly affect the liver and lungs, but can occur in any part of the body, including rare sites like musculoskeletal tissue.case report: we reported a case of a 42-year-old male nurse with a painless mass in the anterior region of his right thigh that developed between 2009 and 2023. no history of trauma, lesions, walking difficulties, or impact on daily activities were observed. he lives in bandar abbas, southern iran, and was admitted to abolfazl hospital in kashmar. the preoperative diagnosis was lipoma. blood tests were normal. both sonography and magnetic resonance imaging detected multiple cysts measuring (140*45 mm) and (144*51*32 mm), respectively. imaging exams showed the size, shape, and location of the cyst. hydatid cyst was diagnosed after surgery. histopathological examination confirmed a hydatid cyst diagnosis.conclusion: hydatid cysts in muscles could occur rarely in muscle (0.5-2.5%). thus, it’s important to consider hydatidosis in the differential diagnosis of soft tissue masses in low-prevalence areas.