An 82 year old woman underwent a lumpectomy following a needle core biopsy.
Diagnosis: Florid hyperplasia without atypia.
Discussion: While necrosis is commonly associated with ductal carcinoma in situ, occasionally florid hyperplasia without atypia may contain luminal necrosis. The presence of necrosis does not affect the diagnosis if the epithelial proliferation is otherwise characteristic of hyperplasia without atypia. Necrosis is not a feature of atypical ductal hyperplasia.