Most cancers are diagnosed by mammography, x-rays, of the breast.
Ultrasound can be used as well, to distinguish a non-cancerous cyst from a solid lump. Some cancers are found by patients or their partners, by feeling a lump. Mri
can be a useful extra test.
There are several types of lumps, benign cysts, benign fibroadenomas, lymph nodes, and cancers. These account for almost all lumps.