Benign Breast Tumours

usual ductal hyperplasia

sclerosing adenosis

atypical hyperplasia

can involve ducts (atypical ductal hyperplasia) or lobules (atypical lobular hyperplasia)
cells lose apical-basal orientation
increased risk of breast cancer
diagnosis: core or excisional biopsy
treatment: complete resection, risk modification (avoid exogenous hormones), close follow-up

Other