Fig. 3A–B.

A 51-year-old woman had a history of hypertension and persistent right shoulder pain that worsened at night, with partial response to medication. Her physical examination showed no signs of shoulder impingement and normal active and passive ROM with no modification in pain. (A) An AP radiograph of her right shoulder shows a 3 × 4-cm central lesion of the proximal humerus with calcifications and a cartilaginous matrix. (B) An axial proton density-weighted MR image shows a cartilaginous tumor of the proximal humerus with a minimal lateral cortical compromise with no soft tissue mass. The final histopathologic diagnosis was a low-grade chondrosarcoma. Only four of 10 evaluators chose the correct diagnosis and poor agreement was observed among them.