• Occurs along primitive milk line, from axilla to groin; may be source of papillary hidradenoma
• Considered by some as normal constituent of anogenital area (Adv Anat Pathol 2011;18:1)
• Excision recommended to prevent development of same benign or malignant processes seen in ordinary breast tissue (Obstet Gynecol 2011;118:478)

• Histology consistent with breast carcinoma
• Non-neoplastic breast tissue or DCIS present in vulva
• Supportive immunohistochemistry (ER+, PR+, GCDFP-15+, HER2+)
• No carcinoma in ordinary breast tissue or other organs
• Inability to locate other primary carcinoma of vulvar glands or skin appendages

• 28 year old woman with vulvar lactating adenoma and fibroadenoma (Pan Afr Med J 2012;13:47)
• 42 year old pregnant woman with ulcerated nodule on labia (Case of the Week #273)
• 43 and 50 year old women with phyllodes tumors (Turk Patoloji Derg 2013;29:73)
• 47 year old woman with mucinous (colloid) adenocarcinoma (Arch Pathol Lab Med 2002;126:1216)
• 58 year old woman with synchronous Paget's disease of breast and vulva (Eur J Gynaecol Oncol 2012;33:534)
• Lactational ectopic breast tissue of vulva (Breastfeed Med 2012 Dec 26 [Epub ahead of print])
• Multiple lactating vulvar adenomas (Obstet Gynecol 2011;118:478)

Case of the Week #273

Phyllodes tumor #1

#2

Mucinous carcinoma

Phyllodes tumor

Vulvar lactating adenoma

Case of the Week #273

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