ABSTRACT
Osteochondromas are common, benign surface tumors of bone, composed of the cartilage-capped
bone confluent with the medullary canal of the metaphyseal bone. Extraskeletal osteochondromas
have the same gross appearance and histologic characteristics as a typical osteochondroma
but do not have any boney attachment to the surrounding osseous structures. They are
rare and most frequently reported in the middle-age and older adults. We present the
first case of an extraskeletal osteochondroma of the foot reported in a teenager.
Our patient was a 17-year-old male complaining of a slow-growing mass along the medial
border of the great toe that he first noted at the age of 14 years. The increasing
size of the mass and frequency of complaints with shoe wear prompted medical attention.
Imaging studies showed an ossified 1-cm boney mass with trabecular detail, located
on the medial aspect of the great toe at the level of the interphalangeal joint, without
any connection to the surrounding structures. An excisional biopsy revealed a well-circumscribed,
easily removable mass, which proved to be an extraskeletal osteochondroma both clinically
and histologically.
Level of Clinical Evidence
Keywords
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Article info
Publication history
Published online: May 10, 2019
Footnotes
Financial Disclosure: None reported.
Conflict of Interest: None reported.
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© 2018 by the American College of Foot and Ankle Surgeons. All rights reserved.
