A large primary hydatid cyst of thigh: a case report.

Primary hydatid disease of musculoskletal system is rare. A 60 year old woman presented with soft swelling in medial aspect of thigh, of long duration which was gradually increasing in size. She was initially diagnosed as lipoma of thigh, but ultrasonography revealed to be a cystic swelling suggestive of hydatid disease. MRI further reinforced the diagnosis. However serologic test (ELISA) was negative. Patient was given albendazole preoperatively. The swelling was removed en bloc and advised for adjunctive albendazole chemotherapy (15 mg/kg/day) for three months.