The incidence of musculoskeletal hydatidosis is not clear. According to several authors, the incidence of musculoskeletal echinococcosis including involvement of subcutaneous tissue is 1% - 5.4% among all cases of hydatid disease 1. The commonest clinical presentation is an asymptomatic slow growing mass. It is usually associated with involvement of other solid organs. Preoperative radiological diagnosis is very important to avoid biopsy. Diagnosis of echinococcosis should be excluded to avoid leakage of cyst contents and the accompanying risks of anaphylaxis and even death 2,3,4,5 . We presented a primary and subfascial involvement of echinococcal disease in the posterior compartment of the proximal thigh has not been reported previously. Case Report In August 2000, a 42-year-old woman referred with 6-month history of a painless mass slowly growing in posterior region of the right thigh. She had no history of trauma or any other health problem. She was living a village and had contact with both sheep and dogs from her childhood. On examination, she had a well-rounded and mobile mass under the fascia on the posterior region of the upper-half part of the thigh. Vascular and neurologic functions, and also motions were within normal ranges. Radiographs revealed a soft tissue mass. A presumptive diagnosis of cyst or neoplasm was made and computed tomography (CT) study was performed. The CT revealed a multilocular cystic mass (13x6 cm) with thick wall behind the muscles of the posterior compartment and under the fascia of the thigh ( Fig.1 ). Thorax radiographies and abdominal ultrasonography revealed no abnormality. Laboratory findings were in normal limits but moderate eosinophilia.
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