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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.
Eccrine hidrocystoma pathology
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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