Osteoid Osteoma (Prepared by Dr Gabriel Castro)
35 y/o male, underwent a Tc99m bone scan to localize the tumor preoperatively and to assure complete extraction of the nidus by using a gamma probe detector . It was completely removed and biopsy was concordant with Osteoid Osteoma. This is a benign skeletal neoplasm of unknown etiology that is composed of osteoid and woven bone. The tumor is usually smaller than 1.5 cm in diameter. Osteoid osteoma can occur in any bone, but in approximately two thirds of patients, the appendicular skeleton is involved. Radionuclide scanning with technetium-99m diphosphonate uptake shows fairly intense activity at the tumor site. Radionuclide scanning is a sensitive technique, and findings may be positive before radiographic changes are apparent.
References:
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2 Tumeh SS. Scintigraphy in the evaluation of arthropathy. Radiol Clin North Am. Mar 1996;34(2):215-31.