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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.
A cystic space occupies the dermis which may be unilocular (figure 1). The cystic space is lined by a thin epithelial layer consisting of 1–2 layers. The cells have slightly eosinophilic cytoplasm, which is bilaminar (figures 2).
Prominent luminal blebbing ('apocrine snouts') is absent.
None are needed.
Apocrine hidrocystoma — some authorities believe eccrine hidrocystoma is actually apocrine in origin. However, the epithelium of aprocrine hidrocystoma has pominent luminal blebbing ('apocrine snouts').
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