Microinvasive breast carcinoma is defined as invasive carcinoma of the breast with no invasive focus measuring more than 1 mm . It is almost always encountered in the setting of ductal carcinoma in situ (DCIS); thus, it is commonly referred to as ductal carcinoma in situ with microinvasion. It is less commonly seen in association with lobular carcinoma in situ (LCIS) or in the absence of noninvasive disease.
The epidemiology, clinical presentation, pathology, and treatment of microinvasive breast carcinoma will be reviewed here. DCIS and LCIS are presented separately.
●(See "Ductal carcinoma in situ: Treatment and prognosis".)
●(See "Breast ductal carcinoma in situ: Epidemiology, clinical manifestations, and diagnosis".)
●(See "Atypia and lobular carcinoma in situ: High risk lesions of the breast".)