Non-ossifying fibroma of the spine.

Non-ossifying fibroma of the spine is a rare disease: three cases have been reported in adults. We report a 17-year-old boy who had an asymptomatic osteolytic lesion of the body of the 1st lumbar vertebra. There were several radiolucent areas with sclerotic margins. The radiologic diagnosis of a non-ossifying fibroma was made. The histologic findings confirmed the diagnosis. Four years after the initial examination, the 1st lumbar vertebra appeared almost normal.