Osteochondroma - humerus

Case contributed by Bahman Rasuli


Painful swelling of the right upper arm with no history of trauma.

Patient Data

Age: 20 years
Gender: Male

A mushroom-shaped, pedunculated bony excrescence arising from the anteromedial aspect of the right humerus diaphysis upper third portion, attached to the parent bone.


Large pedunculated bony excrescence measuring about 35*55*65 mm originating from humerus upper third anterior cortex pointing away from the metaphysis associated with large bursitis measuring about 57*80 mm, biceps muscle belly high-grade partial thickness tear and tearing of biceps tendon short head.

The cartilaginous gap of exostosis also shows a heterogeneous signal intensity.

Abnormal intrasubstance increased fluid signal along with supraspinatus tendon related to tendinosis.

Subacromial-subdeltoid bursitis.

Acromion type II.

Case Discussion

Osteochondromas are a relatively common imaging finding, accounting for 10-15% of all bone tumors and approximately 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 and have very low malignant potential if sporadic and solitary.

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