Musculoskeletal CT Appearances
Hereditary Multiple Exotoses (HME) CT Findings
- At least 2 osteochondromas are needed for a diagnosis
- Commonly bilateral but may be unilateral
- Any bone can be involved
- Usually contain marrow cavity and cartilage cap
- “Bayonet hand” or limb length discrepancy can be seen depending on bones affected
Other Information About Hereditary Multiple Exotoses (HME)
Etiology:
- Passed genetically or caused by genetic mutation
Epidemiology:
- Very rare
- Most patients present by age 12
Presentation:
- Bone and/or joint pain
- Limb length discrepancy
- Bowed arms/legs
- Joint stiffness
Prognosis:
- HME is typically benign
- Surgery can be used to remove tumors and straighten affected bone