04-02-2007, 05:42 PM
A 24-year-old baseball player visits his doctor with complaints of right arm pain. On questioning, he states that it has hurt for several weeks but he has been ignoring it, attributing to muscle strain. Radiographic examination demonstrates an expansile, lytic proximal right humeral epiphyseal lesion. Based on the clinical, radiologic, and biopsy findings, the mass and proximal humerus are resected. On gross examination, the mass demonstrates hemorrhagic areas with multiple small spindle-shaped cells. Laboratory tests performed at the same time demonstrate normal serum and calcium levels. Which of the following is the likely diagnosis?
(A) Aneurysmal bone cyst
(B) Brown tumor
© Giant cell tumor
(D) Ewing sarcoma
(E) Osteoid osteoma
(A) Aneurysmal bone cyst
(B) Brown tumor
© Giant cell tumor
(D) Ewing sarcoma
(E) Osteoid osteoma