Abstract
Costal exostosis occurs either sporadically or as a manifestation of hereditary multiple osteochondromas (HMOs), a disorder that is inherited in an autosomal dominant manner. Costal exostosis may cause chest pain and, on rare occasions, result in intra-thoracic complications. We report a case of a 15-year-old boy with exostosis in the right anterior fifth rib, who presented with protruded painful skin lesions that had ulcerated over the last one month. He previously received a diagnosis of multiple exostoses. There was no evidence of a malignant change on histopathological analysis. Enbloc excision was done and there has been no recurrence to date. To the best of our knowledge, the present case is the only report of costal exostosis presenting as an extrathoracic chest wall ulcerating mass. The present report illustrates this rare clinical scenario and reviews the relevant literature.
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