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 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.
None are needed.
Apocrine hidrocystoma: Some authorities believe eccrine hidrocystoma is also apocrine derived. The epithelium of aprocrine hidrocytoma has pominent luminal blebbing ("apocrine snouts").
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