title: Villous Tumor of the Urinary Bladder Resembling Low-grade Mucinous Neoplasm of the Appendix.
abstract: Mucinous neoplasms of the urinary tract are very rare. We present a 63-year-old-women who had a sessile papillary villous tumor in urinary bladder. Although transurethral resection of the bladder tumor (TURBT) was performed, the villous tumor repetitively recurred and gradually spread to the entire surface of bladder lumen. Histopathologic and immunohistochemical examination showed that the lesion was very similar to low-grade mucinous neoplasm arising in appendix vermiformis. There are no reports on appendiceal metaplasia of urinary bladder mucosa. In this case, we describe this unprecedented neoplasm as "villous tumor of the urinary bladder resembling low-grade mucinous neoplasm of the appendix."
authors.affiliation: Department of Urology, Kagawa University Faculty of Medicine, Kagawa, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Ito
authors.affiliation: Department of Urology, Kagawa University Faculty of Medicine, Kagawa, Japan.
authors.forename: Yuma
authors.initials: Y
authors.lastname: Sakura
authors.affiliation: Department of Urology, Kagawa University Faculty of Medicine, Kagawa, Japan.
authors.forename: Mikio
authors.initials: M
authors.lastname: Sugimoto
authors.affiliation: Department of Urology, Kagawa University Faculty of Medicine, Kagawa, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kakehi
authors.affiliation: Department of Diagnostic Pathology, Kochi Red Cross Hospital, Kochi, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Kuroda
keywords: Appendiceal-type; Mucinous neoplasm; Urinary bladder tumor; Villous tumor