<prompt> The type of breast carcinoma characterized by a pushing borderInvasive ductalInvasive lobularMucinousMedullary  <response>: Medullary carcinoma is a rare subtype of carcinoma, accounting for less than 1 of breast cancers. These cancers consist of sheets of large anaplastic cells with well circumscribed, pushing borders Clinically, they can be mistaken for fibroadenomas ref : Robbins Basic Pathology, 9E,page-712 