Clinical Features:

• Cysts produced by dilation eccrine (eccrine hidrocystoma) or apocrine (apocrine hidrocystoma) with secondary epithelial proliferation
• Present as bluish papules or nodules
• Most common in the periorbital region
• More common in warm climates

Histologic Features:

• Eccrine hidrocystomas are lined by one to two layers of cuboidal to flattened epithelial cells, sometimes with squamous metaplasia, with or without connection to an eccrine duct.
• Apocrine hidrocystomas are lined by an inner layer of eosinophilic, columnar apocrine-type cells with decapitation secretion and an outer layer of myoepithelial cells.  Papillary projections may sometimes be seen.
• In many instances a lesion cannot be readily defined as eccrine or apocrine, and this distinction is not essential from a clinical standpoint.

Cases associated with this book:

Hidrocystoma
Author: Artur Zembowicz M.D. Ph.D.

Conference: DermatopathologyConsultations.com Teaching Collection

Hidrocystoma
Author: Artur Zembowicz M.D. Ph.D.

Conference: Dr. Z's Consultations

Apocrine hidrocystoma
Author: Artur Zembowicz M.D. Ph.D.

Conference: Dr. Z's Consultations