Atypical papilloma: It is essentially a papilloma(which is a benign tumor of the breast duct) that has a component of atypical ductal hyperplasia(ADH (vasopressin)). ADH (vasopressin) is not cancer,but it can be considered a precursor, or at least a high risk marker, for cancer. Atypical papillomas dx'd at core biopsy should undergo complete excision. After surgery, about 30% will be upgraded at least to in situ cancer.
Answered 7/19/2019
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