Clinical Presentation

A preteen with shoulder pain.

Frontal radiograph of the shoulder demonstrates a lytic lesion in the proximal humeral epiphysis, with no evidence of fracture or periosteal reaction (arrows). The lesion does not cross the growth plate.

Differential Diagnosis

• Chondroblastoma: The epiphyseal origin, eccentric location, lytic appearance, and sharp borders are all typical.

• Giant cell tumor: