Type of DCIS resulting in palpable abnormality

Paget disease of the nipple is caused by the extension of DCIS up the lactiferous ducts and into the contiguous skin of the nipple, producing a unilateral crusting exudate over the nipple and areolar skin. In almost all cases, an underlying carcinoma is present, and approximately 50% of the time this carcinoma is invasive. Prognosis is based on the underlying carcinoma and is not affected by the presence of Paget disease ref : Robbins Basic Pathology, 9E,page-710