Primary renal osteosarcoma

A recent case of primary osteosarcoma of the kidney prompted a review of the literature for this rare malignancy. Six cases have been recorded, and this case represents the seventh. The clinical and pathologic features of this lethal tumor are discussed. The presentation of flank pain, gross hematuria, a palpable mass, and a localized parenchymal calcification on x-ray film should alert the clinician to the possibility of renal osteosarcoma.