Invasive breast papillary carcinoma with mucinous stroma.

Invasive breast papillary carcinoma is a rare type of breast cancer histologically characterized by infiltrative papillary growth without visible surrounding fibrous capsule. Here, we report the case of an invasive papillary carcinoma in which invasive papillary fronds were surrounded by abundant mucinous stroma, an occurrence that has not been described so far in this type of breast cancer.