comedocarcinoma

noun

com·​e·​do·​car·​ci·​no·​ma ˌkäm-ə-ˌdō-ˌkärs-ᵊn-ˈō-mə 

plural comedocarcinomas also comedocarcinomata -mət-ə 

: breast cancer that arises in the larger ducts and is characterized by slow growth, late metastasis, and the accumulation of solid plugs of atypical and degenerating cells in the ducts