Osteoid osteoma - femur

Case contributed by Ammar Haouimi

Presentation

Pain with limited range of motion of the left hip.

Patient Data

Age: 9 years
Gender: Male
ct

Small well-circumscribed osteolytic lesion of the femoral neck (nidus) with peripheral reactive sclerosis, focal cortical breach, periosteal reaction and central foci of calcification (central mineralization). Mild joint effusion is noted.

Normal appearance of the right hip.

Case Discussion

CT features most consistent with an osteoid osteoma of the femoral neck.

CT is considered the modality of choice for the detection of osteoid osteoma. It typically shows a focally lucent nidus within the surrounding sclerotic reactive bone. A central sclerotic dot may also be seen.

The most common location is the long bones of the limbs (~65-80%), especially the neck of the femur (as in this case).

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