<prompt> Which type of breast carcinoma is bilateral and multicentric?DuctalLobularMedullaryColloid  <response>: 1Ans: b Lobular Ref: Bailey, 24thMost Ca breast are adenocarcinoma.Types: Ductal: in situ invasive LobularMost common type: invasive ductal typeDuctal carcinoma arises from epitheliumColloid carcinoma--Cells produce abundant mucinMedullary Ca-- Solid sheets of large cells often associated with marked lymphocytic reactionInfiltrative Ca-- Rare highly aggressive Ca that present as a painful swollen breast with cutaneous odema.Tubular CaBreast carcinoma with good prognosis even with axillary lymph nodes--medullary CaBulls eye appearance is seen in - invasive lobularDesmoplastic reaction is shown by - ductal invasiveComedo carcinoma is - ductal carcinoma in situ DCISMost common variant of breast carcinoma- ductal invasiveLobular carcinoma - multicentric and bilateralThe underlying lobular architecture can still be recognised on microscopic examination Indian file pattern is seen 