<prompt> Bilateral breast ca is -Scirrhous caMedullary caLobular caDuctal ca  <response>: Lobular carcinoma invasive is frequently bilateral.Lobular carcinoma in situ in 20-40 cases are bilateral.Features of invasive lobular carcinoma of breast are :Histologic hallmark : pattern of single infiltrating tumor cells often only one cell in width or in loose clusters or sheets.Signet ring cells commonLobular carcinoma have a different pattern of metastasis compared to other breast cancers. metastases to the peritoneum, retroperitoneum, leptomeninges Carcinomatous meningitis, the git, and the ovaries uterus are frequently observed, these carcinomas are less likely to metastasize to lung and pleura. 