May also have enteric morphology (looks like colorectal adenocarcinoma).
Other morphologies include signet ring cell, which can diffusely spread into the bladder, and adenocarcinoma, not otherwise classifiable, or a mixed of these different patterns.
Similar immunohistochemical staining (CDX2+, CK7+ and β-catenin-) with urachal adenocarcinoma.
Treated by en bloc resection of bladder, urachal remnant, and umbilicus.
Staging is different from bladder urothelial carcinoma.
Poor survival, reported 5-year survival at 25-61%.