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Multiple hereditary exostoses
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Multiple hereditary exostoses

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Synopsis

A rare, autosomal dominant genetic condition resulting in the development of multiple osteochondromas (exostoses) at the metaphyses or diaphyses of long bones, commonly affecting the vertebrae, ribs, limbs, hands, fingers, shoulders, and hips. Caused by mutations in the EXT1 or EXT2 genes. Osteochondromas are benign tumors consisting of bone overgrowths and capped with cartilage. They begin formation during regular bone growth and stop growing when the patient reaches skeletal maturity. The severity of the condition is widely variable. The presence of osteochondromas can cause pain, short stature, various deformities, limb length discrepancy, hip dysplasia, and movement difficulties. The deformities may also cause nerve, blood vessel, or spinal cord compression. Most exostoses remain benign, but some may become malignant.

Codes

ICD10CM:
Q78.6 – Multiple congenital exostoses

SNOMEDCT:
254044004 – Multiple congenital exostosis

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Last Updated:01/19/2022
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Multiple hereditary exostoses
Imaging Studies image of Multiple hereditary exostoses - imageId=8336227. Click to open in gallery.  caption: 'I<span>n a patient with multiple  hereditary exostoses, there are multiple sessile and pedunculated  osteochondromas projecting off of the humerus, scapula, and clavicle.</span>'
In a patient with multiple hereditary exostoses, there are multiple sessile and pedunculated osteochondromas projecting off of the humerus, scapula, and clavicle.
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