General
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• Also known as papillary hidradenoma
• Benign, small, sharply circumscribed nodule covered by normal skin, often on labia majora or interlabial folds
• May ulcerate through skin and simulate carcinoma
• May derive from ectopic mammary tissue (resembles intraductal papilloma)

Case reports
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• 35 year old woman with painless vulvar nodule (Case of the Week #343)
• Patient with associated intraductal apocrine breast cancer (GCDFP-15+, ER+, PR+) (Arch Pathol Lab Med 1991;115:1249)

Micro description
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• Well differentiated, complex papillary glandular pattern with some stratification and pleomorphism
• Myoepithelial layer usually present

Micro images
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H&E images

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