Intraductal carcinoma of the prostate is an aggressive form of invasive carcinoma and should be graded - Samaratunga, Hemamali; Delahunt, Brett; Egevad, Lars; Srigley, John R; Billis, Athanase; Bostwick, David G; Camparo, Philippe; Cheng, Liang; Clouston, David; Leite, Katia Ramos Moreira (Pathology, 2020)