1. Presented by Dr. Jonathan Epstein and prepared by Dr. Robby Jones.

Clinical History: A 65 year old woman underwent a transurethral resection for a bladder mass. The tumor was positive for Gross Cystic Duct Fluid Protein (GCDFP), progesterone receptor (PR), GATA3, uroplakin II with negative staining for estrogen receptor (ER). Some of the cells with signet-ring cell vacuoles were positive for mucicarmine.










Choose the correct diagnosis: