Presentation
Arm discomfort.
Patient Data
There is proximal humeral bony excrescence as well as a protrusion of the cortex laterally with indentation of the adjacent deltoid muscle, the medullary cavity of the exostosis is directly continuous with that of the humerus showing ground glass matrix , this is associated with cortical thinning and expansion of the proximal right humeral diametaphysis. These findings are suggestive of exostosis
Case Discussion
Osteochondromas are a relatively common imaging finding, accounting for 10-15% of all bone tumors and ~35% of all benign bone tumors. Although usually thought of as a benign bone tumor, they may be thought of as a developmental anomaly. They are frequently asymptomatic