CT of osteoid osteoma of the femoral neck: the value of oblique reformatting.

An osteoid osteoma is a benign bone lesion which may involve the femoral neck. The lesions are distinctively osteoblastic, containing a central fibrovascular and osteoid nidus which often evokes substantial periosteal reaction occasionally making the diagnosis by conventional radiography very difficult. Computed tomographic evaluation of these lesions at other sites has been previously reported. I wish to emphasize the unique value of CT multiplanar reformatting in a patient with an osteoid osteoma of the femoral neck.