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Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Apocrine hidrocystomas are regarded by some authorities to represent cystic retention of apocrine glands. Others believe they are adenomatous lesions.
Histology of apocrine hidrocystoma
A cystic space occupies the dermis which may be unilocular (figure 1) or multilocular. The cystic space is lined by a bilaminar epithelium which has on its inner portion cells which are columnar, eosinophilic and show prominent luminal blebbing (‘apocrine snouts’) (figures 2 and 3).
Epithelial proliferations may be seen within the cyst.