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Syringocystadenoma papilliferum (SCAP) is a rare benign hamartomatous tumor of adnexal origin stemming from either apocrine or eccrine glands. This tumor appears early in life with 50% of cases developing at birth and 15-30% of cases arising in puberty.1 Presentation during adulthood is uncommon and more likely to represent malignant syringocystadenocarcinoma papilliferum (SCACP).2-3 SCAP arises in three forms: plaque, linear, and solitary nodular type. The plaque type appears as an alopecic patch on the scalp, often enlarging during puberty into a warty, nodular, or crusted plaque. The linear type presents as multiple red papules or nodules 1-10 mm in size. The nodular type presents as domed pedunculated nodules 5-10 mm in size, typically found on the trunk.4 We present a case of large plaque SCAP without malignant transformation arising in a 73-year-old adult woman and a concise description of our histopathologic findings.

Syringocystadenoma Papilliferum of the Scalp Arising De-Novo in an Elderly Female