-Apatite rheumatism, unusual aspects-

Apatite calcifications may be responsible for unusual aspects. Clinically they may mimick sepsis or soft tissue tumor, and radiologically a bone tumor or soft tissue tumor-like lesion with respect to the erosion of the bone cortex adjacent to an unusual calcification. Diagnosis is based on knowledge of atypical sites of calcification, CT, and mainly, radiological regression of the calcification after a short follow-up.