Case report 472: Heretical giant cell tumor in the diaphysis of the ulna in a 7-month-old boy

We believe this to be the youngest reported patient with giant cell tumor of bone. The patient's age, location of tumor, gross appearance and radiographic findings are all highly unusual for giant cell tumor; however, we consider the histopathological changes to be diagnostic. Full clinical evaluation and patient follow-up confirm our impression. The unpredictable behavior of these lesions is well known. This case illustrates that the clinical presentation may, occasionally, be misleading as well. (orig.)