[2] Rare cases of this carcinoma have been diagnosed in men (see male breast cancer).

[3] Mucinous carcinoma of the breast grows slowly and can become a large size before diagnosis.

Late diagnosis is also due to how the mucinous contents of the tumor don't feel solid.

Mammography, ultrasound, MRI, and tissue biopsy are often employed to diagnose mucinous breast carcinoma.

With a 5-year survival rate of 81% to 94%, mucinous breast cancer tends to have a good prognosis.