Calcinosis Cutis Inducing "Syringomatoid" Eccrine Hyperplasia: An Extremely Rare Example.

Reactive "syringomatoid" eccrine proliferations are a well-established phenomenon, which can show similar but less extensive histological features of a syringoma. The cut-off between syringomatoid hyperplasia and syringomas is subjective and given the considerable morphological overlap, it is possible they represent two points on the same spectrum. Syringomatoid hyperplasia has been associated with several conditions including neoplasms and inflammatory dermatoses. Herein, we describe an extremely rare case of syringomatoid hyperplasia occurring with calcinosis cutis in a 54-year-old Caucasian male. To the best of the authors' knowledge, this is the first such case described in the literature.