Presentation
Palpable painless lump of the left upper arm.
Patient Data
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 oedema with enhancement within the bony lesion. No oedema 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
Unable to process the form. Check for errors and try again.