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Syringocystadenoma papilliferum is a rare benign adnexal tumor commonly located on the head and neck region and is usually associated with a nevus sebaceous. Linear lesions are uncommon and lesions on the breast are extremely rare. We report here a case of linear SCAP occurring de novo on the left breast of a 35-year-old healthy woman. Histopathology showed the characteristic papillary projections lined by double layer of cells inside epidermal invaginations.

Syringocystadenoma papilliferum is a rare benign adnexal tumor commonly located on the head and neck region and is usually associated with a nevus sebaceous. Linear lesions are uncommon and lesions on the breast are extremely rare. We report here a case of linear SCAP occurring de novo on the left breast of a 35-year-old healthy woman. Histopathology showed the characteristic papillary projections lined by double layer of cells inside epidermal invaginations.

Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is an uncommon, benign dermatosis that is characterized by asymptomatic grouped keratotic papules and plaques with a linear pattern on the extremities with distinct porokeratotic histopathological features. The lesions usually appear at birth or in childhood, although rare cases of late-onset adult PEODDN have been described. Herein we report a case of adult onset PEODDN with unilateral and segmental involvement.

Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is an uncommon, benign dermatosis that is characterized by asymptomatic grouped keratotic papules and plaques with a linear pattern on the extremities with distinct porokeratotic histopathological features. The lesions usually appear at birth or in childhood, although rare cases of late-onset adult PEODDN have been described. Herein we report a case of adult onset PEODDN with unilateral and segmental involvement.