Pachydermodactyly of a single finger

Pachydermodactyly is a non-inflammatory swelling which involves the dorsal and lateral surfaces of the fingers, at the level of proximal phalanges and interphalangeal joints. In the majority of cases 3 fingers are affected (only 3 cases of pachydermodactyly localized to a single finger have been described). The disorder is much more common in males (only 4 women have been reported). We present a clinical, histopathological and ultrastructural study of a woman with pachydermodactyly localized exclusively to one finger.