Osteochondroma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Maria Fernanda Villarreal, M.D. [2]

Overview

Osteochondromas may be classified into 2 subtypes: solitary osteochondromas (non-hereditary) and multiple osteochondromas (hereditary).

Classification

The table below differentiates between the 2 subtypes of osteochondromas:

Type of Osteochondroma	Features
Solitary osteochondroma	Non-hereditary 85% of osteochondromas No genetic mutations Located in long bones Onset is in early adolescence
Multiple osteochondromas	Hereditary Approximately 20% of osteochondromas Related genetic mutations EXT-1 and EXT-2 Early onset of disease (newborn or children)