Abstract
A caseworker pointed out to a woman in her 80s the presence of erosion of her left nipple. A skin biopsy was performed and she was diagnosed with mammary Paget's disease. Subsequently, she was referred to our hospital. Her left nipple was retracted and caved in. Furthermore, crust and bloody discharge were present at her left nipple. A 2cm×2cm sized elastic hard tumor whose margin was unclear was touchable on the superolateral region of her left breast. Mammography and MRI imaging were performed and then, simple mastectomy and sentinel node biopsy were performed. She was diagnosed with mammary Pagetoid cancer by pathological examination. Because mammary Pagetoid cancer has a worse prognosis than mammary Paget's disease, it is very important to distinguish one from the other.[Skin Cancer (Japan) 2009 ; 24 : 278-282]
