is a noncancerous growth of multiple milk duct tumors (papillomas).

is a noncancerous duct growth that may raise future breast cancer risk.

is a rare benign breast condition in teens, causing multiple papillomas.

is a rare, aggressive breast cancer with neuroendocrine (hormone-producing) features.

is a rare, benign breast tumor of smooth muscle cells.

is a rare malignant tumor of the breast's smooth muscle tissue.

is a rare, often aggressive breast cancer with lipid-rich cells.

is a benign (noncancerous), soft, slow-growing fatty lump in breast tissue.

is a rare malignant tumor of breast fat (adipose) tissue.

is a breast cancer beginning in milk-producing lobules, sometimes harder to detect.

is a rare lymphoma affecting breast tissue, usually a non-Hodgkin type.

is a rare, aggressive sweat gland cancer arising in breast tissue.

is a rare, fast-growing breast cancer of connective (stromal) tissue.

is a rare invasive breast cancer subtype with often favorable outcomes.

is a rare, aggressive breast cancer with mixed cell types.

is a rare breast cancer with mucus-producing tumor cells, often slow-growing.

is a rare breast cancer that forms mucus-filled (mucinous) tumors.

is a rare breast cancer subtype with mucous and epidermoid cells.

is a rare, often aggressive breast cancer from myoepithelial (supporting) cells.

is a rare breast tumor from myoepithelial cells, benign or malignant.

is a rare, usually benign overgrowth of breast myoepithelial cells.

is a rare, noncancerous breast tumor of connective tissue, usually painless.

is a rare breast tumor with neuroendocrine features, slow or aggressive.

is a rare breast cancer subtype with distinctive mitochondria-rich tumor cells.