How is breat in situ carcinoma?

➢ There are two morphologic types of noninvasive breast carcinoma: ductal carcinoma in situ (DCIS) Lobular carcinoma in situ (LCIS). ➢ The terms ductal and lobular are misleading, as both types of CIS are thought to arise from cells in the terminal duct that give rise to lobules. ➢ LCIS usually expands involved lobules, whereas DCIS distorts lobules into ductlike spaces. ➢ By definition, both “respect” the basement membrane and do not invade into stroma or lymphovascular channels