Abstract
Introduction: hydatid cysts are produced by the Echinococcus granulosus parasite. The single location in the muscles is rare. The cystic mass can be confirmed by ultrasound or magnetic resonance imaging (MRI) and its differential diagnosis may be difficult. Material and method: We present a case with a tumorous mass in thigh with MRI report: "encapsulated cystic lesion dependent on the biceps femoris, which contacts the sciatic neurovascular bundle, being the 1st diagnostic possibility hydatid cyst". Mebendazole was prescribed and after a month the tumor was excised, which was not located within the muscle but rather pushing it, attached to the sciatic nerve. Diagnosis after anatomopathological study was sciatic schwannoma. Discussion and conclusion: on MRI, schwannomas are usually seen as a mass adhered and eccentric to a nerve, but they can present cystic degeneration mimicking hydatidic cyst; Faced with a single muscular or perimuscular cystic tumor, close to the neurovascular bundle, with negative systemic tests for parasite disease, the schwannoma should be taken into account in the differential diagnosis.
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