Sessile osteochondroma - humerus

Case contributed by Dr Ammar Haouimi


Palpable painless lump of the left upper arm.

Patient Data

Age: 10 years
Gender: Female

A sessile bony mass arising from the proximal metaphyso-diaphyseal region of the left humerus, displacing the overlying soft tissues with no periosteal reaction seen.


The sessile bony mass arises from the posterior aspect of the proximal humeral metaphyso-diaphysis. The medullary cavity is in continuity with that of the parent bone as well as the cortex with no fracture or periosteal reaction seen. The cartilage cap is 2 mm in the thickness. Subcortical edema with enhancement within the bony lesion. No edema or abnormal enhancement of the adjacent surrounding tissue.

Case Discussion

Plain film and MRI features are of a sessile osteochondroma

MRI is the best imaging modality to assess cartilage thickness. A cartilage cap of over 1.5 cm in thickness is suspicious for malignant degeneration.


Additional contributor: ZE. Boudiaf, MD CHU, Constantine, Algeria

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Case information

rID: 69764
Published: 21st Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: Aurès Medical Imaging Center - Batna Algeria

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