LCIS and a condition called atypical lobular hyperplasia (ALH) are both considered lobular neoplasia. In-situ carcinoma with duct and lobular features means that the in-situ carcinoma looks like DCIS in some ways and LCIS in some ways (when seen under the microscope), so the pathologist can't call it one or the other.

Which is worse LCIS or DCIS?

This is in contrast to LCIS which has risk for the development of invasive breast cancer in either breast over time. In summary, LCIS is considered a risk factor for invasive cancer while DCIS is considered a precursor to invasive cancer.

Is LCIS the same as DCIS?

Lobular carcinoma in situ (LCIS) is a type of in-situ carcinoma of the breast. While DCIS is considered a pre-cancer, it is unclear whether LCIS is definitely a pre-cancer or if it is just a general risk factor for developing breast cancer.