[A Case of Paget's Disease of the Breast in a Young Adult Woman].

Paget's disease of the breast in young women is rare. We report a case of Paget's disease of the breast in a woman in her 30s. She had eczema on the right nipple since February 202X. Ointment application did not relieve the symptoms, and topical steroids were used, but there was no improvement. In April 202X+1, a skin biopsy was performed from the nipple erosions. Pathological examination confirmed the diagnosis of Paget's disease of the breast. Imaging studies showed no evidence of tumoral lesions. In July 202X+1, skin-sparing mastectomy with reconstruction using a tissue expander and sentinel node biopsy were performed. Pathology results of the excised specimen showed Paget's disease and a 3×2 cm noninvasive ductal carcinoma of the outer inferior area in the right breast. Eight months after surgery, a latissimus dorsi musculocutaneous flap reconstruction was performed. The diagnosis of Paget's disease should be considered in young patients with persistent nipple erosions. And it is difficult to accurately detect breast cancer lesion when Paget's disease is diagnosed, and mastectomy plus breast reconstruction is a good indication considering the patient's cosmetic appearance.