Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Eccrine hidrocystoma is a cystic lesion, thought to be derived from cystic retention of native eccrine glands. This entity has been challenged by some authorities who regard these as having an apocrine origin.
Histology of eccrine hidrocystoma
A cystic space occupies the dermis which may be unilocular (figure 1). The cystic space is lined by an thin epithelial layer consisting of 1-2 layers. The cells have an slightly eosinophilic cytoplasm, bilaminar (figures 2).
Prominent luminal blebbing ("apocrine snouts") is absent.