<unk>  <unk> , is an overgrowth of myofibroblastic cells in the breast. It has an appearance similar to fibroadenomatoid changes. The diagnostic significance is currently uncertain, but it appears to be benign. There have been cases of<unk>  diagnosed where the tumors co-exist with breast cancer. Other cases have made screening for breast cancer difficult and in some cases impossible due to the number and density of the existing<unk>  tumors. These cases have resulted in the necessity of a mastectomy and double mastectomy.
Pseudoangiomatous stromal hyperplasia
Germ cell neoplasia in situ
Surface epithelial-stromal tumor
Leiomyomatous hamartoma
Microglandular hyperplasia
Epithelial dysplasia
In situ lymphoid neoplasia
Mesothelial hyperplasia