A case of pseudocarcinomatous hyperplasia of the urothelium associated with primary extranodal marginal-type lymphoma of the urinary bladder in an 81-year-old man is described. To the best of our knowledge, this is the first report in the literature of a primary lymphoma of the bladder associated with pseudocarcinomatous hyperplasia of the urothelium, closely mimicking the nested variant of urothelial carcinoma. The lesion enters in the differential diagnosis with a collision tumor, which has been described rarely in the bladder.
Pseudocarcinomatous hyperplasia associated with primary lymphoma in the urinary bladder: a case report / Montironi, Rodolfo; Santoni, Matteo; Goteri, Gaia; Mazzucchelli, Roberta; Lopez Beltran, A; Cheng, L; Scarpelli, Marina. - In: HUMAN PATHOLOGY. - ISSN 0046-8177. - ELETTRONICO. - 46:7(2015), pp. 1040-1044. [10.1016/j.humpath.2015.03.004]