Uncommon radiologic appearance of bony hydatidosis in child

The authors report 2 cases of 2 children aging 11 and 12-years-old presenti ng hydatitosis in the upper extremity of 2 long bones femur and tibia. In 2 cases, radiological appearances were atypical. In the femur, plain radiogr aphs revealed multiple lucencies, irregular, located in the superior extrem ity with a periostal reaction. The CT scan confirmed these data and showed a cortical rupture, extension to soft tissue with contrast enhancement. In the tibia, plain radiographys showed delimitated lucencies, confluent with a rim condensation in the proximal epiphyseal-metaphyseal area. Echography and CT are helpful when radiological appearances are unusual.