Ainhum, also known as dactylolysis spontanea, is a rare cutaneous condition in which a hyperkeratotic band partially or totally encircles a digit. The constriction thins the underlying bone, which is then prone to fracture. Some cases result in autoamputation.
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Epidemiology
Some have suggested that the disease is much more prevalent in those with melanotic skin (e.g. Africans) 2.
Radiologic features
- marked soft tissue constriction around a digit
- possible underlying fracture or autoamputation
History and etymology
The word "ainhum" is thought to derive from the naga dialect in Burma, meaning "to saw" or "to cut".
Differential diagnosis
"Pseudoainhum" can occur in other disorders, including
- leprosy
- amniotic bands
- psoriasis
- palmoplantar keratoderma
- pachonychia congenita
- Vohwinkel disease