Fact-sheet: Subungueal exostosis
Updated on 04/23/2019 at 9:56 AM
View all RADEOS cases associated with this fact-sheet
Definition
Belongs to the spectrum of reactive periostitis (periosteal, rather than enchondral, ossification, unlike cartilaginous lesions).
Uncertain etiopathogenesis: traumatic, microtraumatic, teratologic, hereditary, infectious theories...
Clinical features
Occurs mainly on the dorsal and medial aspect of the hallux (90% of cases), more rarely on the hand at the first two digits.
Painful and sometimes ulcerated.
Radiography
Well-defined corticocancellous outgrowth with a broad (sessile) or narrow (pedunculated) base.
Cortical outline and cancellous content continuous with those of the underlying bone.
The tip of the exostosis may be finely corticated or irregular.
