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.

https://www.cancer.org/treatment/understanding-your-diagnosis/tests/understanding-your-pathology-report/breast-pathology/lobular-carcinoma-in-situ.html