+ Most common features Classic<unk>  Pleomorphic<unk>  Grades Low or high (II/III) High (III) AJCC stage I II Lymph node status Negative Positive ER/PR status Positive Positive Surgery type Lumpectomy Mastectomy The histologic patterns include: Type Prevalence Description Image Classical 40% Round or ovoid cells with little cytoplasm in a single-file infiltrating pattern, sometimes concentrically giving a targetoid pattern 180px Mixed 40% No dominant pattern Solid 10% Sheets of classical-appearing cells with little intervening stroma Alveolar 5% Aggregates of classical-appearing cells Tubulolobular 5% Cells form microtubules in >90% of tumor (smaller than in tubular carcinoma) Pleomorphic Classical-appearing but with pleomorphic cells. It may include signet-ring cells, or plasmacytoid cells (pictured) which have abundant cytoplasm and eccentric nuclei. center File:Histopathology of<unk> , next to<unk>  carcinoma in situ, annotated.Histopathology of<unk>  <unk> , next to<unk>  carcinoma in situ (LCIS). File:Breast<unk>  (2).Invasive<unk>  carcinoma demonstrating a predominantly<unk>  growth pattern. Image:LobularBreastCancer.Lobular breast cancer. Single file cells and cell nests.
Invasive lobular carcinoma
Ductal carcinoma in situ
Lobular carcinoma in situ
Atypical ductal hyperplasia
Invasive carcinoma of no special type
Intraductal papilloma
Basal-like carcinoma
Mucinous carcinoma of the breast