breast intraductal proliferative lesion hyperplasia usual ductal breast hyperplasia NCIT:C27941 UDH MONDO:0006484 A neoplastic ductal proliferative lesion of the breast characterized by the formation of secondary lumens and prominent intraductal proliferation of a heterogeneous cellular population that may include epithelial cells, myoepithelial cells, or metaplastic apocrine cells. ordinary intraductal breast hyperplasia UMLS:C3532429 ICD9:611.89 EFO:1000612 MEDGEN:759542 ductal breast hyperplasia of usual type SCTID:472905007