[Breast lobular carcinoma in situ: diagnosis and evolution].

The incidence of lobular cancers in situ is increasing, especially in post-menopausal women. Whereas this form of disease was regarded for a long time as nothing but a risk factor of the occurrence of later infiltrating carcinoma, it now tends to represent a precancerous state whose progression to subsequent infiltrating carcinoma does not inevitably occur. The clinical and radiological diagnosis remains difficult and the choice of therapies varies according to teams, ranging from mere surveillance to mastectomy.