Case 22
History:
45 year old female with chronic left thigh pain
Findings:
CT scan of the proximal left femur shows radiolucent nidus surrounded by a reactive sclerosis in the cortex.
Diagnosis:
Discussion:
Osteoid osteoma (OO) is a benign skeletal neoplasm. They account for approximately 10 percent of benign bone tumors. Osteo osteoma occurs most frequently in the second decade. About 80 percent of OO cases are cortical. The rest are intramedullary. The proximal femur is the most common location followed by the tibia, posterior elements of the spine, and the humerus.
The classic radiological appearance is a radiolucent nidus surrounded by a reactive sclerosis in the cortex of the bone usually less than 2 cm in long axis. The tumors may regress spontaneously.
References:
- Bloem, J and H. Kroon, Osseous Lesions, Radiologic Clinics of North America,31(2):261-277, March, 1993. DGitelis, S, Wilkins, R and EU
- Helms CA, Hattner RS, Vogler JB III, Vogler JB. Osteoid osteoma: radionuclide diagnosis. Radiology, 1984;151 (3):779-84.
