[An unusual case of chondrosarcoma in a 5-year old boy]

A case of chondrosarcoma in 5 years old boy is presented. This type of neoplasm is extremely rare in this age group usually affecting patients in their forties and fifties. The tumor was located in the acetabular part of the ilium, ischial bone and the capsule what, again, is very rare, especially in children. Radiographs were atypical; there were no cloudy calcifications characteristic for malignant chondral tumors. The boy spent 2.5 years in several hospitals with various diagnoses being treated accordingly. The surgery performed was not radical: focal excision of the tumor was done and the capsule was entirely removed. No signs of avascular necrosis and no signs of neoplastic process recurrence were observed during 3 years follow-up.