We report 2 cases of primary muscular hydatosis of the thigh in a 30-y
ear-woman and a 75-year-man. The clinical picture was a benign soft ti
ssue tumor. The ultrasound and C. T. scan exams confirmed the diagnosi
s and showed precisely the intimacy of the lesion with the femoral vas
cular axe. Preoperative diagnosis of this affection is mandatory in or
der to prevent any rupture of the cyst so as to avoid anaphylactic sho
ck and local recurrence. Percystectomy is the treatment of choice for
this lesion.