Histological patterns of « intraductal carcinoma » were observed in lymph node metastases, in 16 of 69 intraductal carcinomas of the breast. The so-called intraductal cancer, generally considered a « in situ » carcinoma of the breast, is therefore an infiltrating tumor; its histological picture, present sometime also in the metastases, is related to a particular morphogenetic differentiative activity of the tumor cells.
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