Primary hydatidosis of distal femur masquerading malignancy -A rare case.

Hydatidosis is relatively uncommon entity and it rarely affects bone and joints. A rare case of primary hydatidosis (Echhinococcus granulosus infection) involving the distal femur and the knee joint in a 53 years old female is reported here. This presented as a pathological supracondylar fracture of femur. On establishment of a clinical diagnosis she was treated preoperatively with Albendazole 600 mg, daily for 3 cycles each of 21 days with a gap of 1 weeks between cycles. Two stage surgery was carried out, the first being a meticulous debridement and second a total knee replacement with cemented tumor mega-prosthesis. Postoperatively the wound healed completely without any evidence of infection and albendazole therapy was continued for three months following surgery. During the follow-up period of two and a half year, no recurrence of hydatidosis was noticed.