title: Mucinous cystadenoma of a horseshoe kidney: A case report and literature review.
abstract: A 45-year-old man complained of a palpable mass in his left abdomen. Computed tomography showed a horseshoe kidney with a Bosniak type II complicated cyst from a left segment. Three years after his initial examination, due to the growing cystic lesion and the compression imposed on the urinary collecting system and surrounding organs, we performed a left heminephrectomy. The diagnosis was mucinous cystadenoma of the kidney. No recurrence was observed 6 months after surgery. The histopathology was unique since the inner surface of the cyst was covered by a mucin-positive columnar epithelium connected to a urothelium, with continuous transition between the two. This suggests that the mucinous tumour may have originated from a sequestered segment of the renal pelvic epithelium in the renal parenchyma.
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Taku
authors.initials: T
authors.lastname: Mitome
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yao
authors.affiliation: Department of Pathology, Yokohama City University Hospital, Yokohama, Kanagawa, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Udaka
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Shusei
authors.initials: S
authors.lastname: Fusayasu
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Koji
authors.initials: K
authors.lastname: Izumi
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Kimito
authors.initials: K
authors.lastname: Osaka
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Narihiko
authors.initials: N
authors.lastname: Hayashi
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Noboru
authors.initials: N
authors.lastname: Nakaigawa
authors.affiliation: Department of Molecular Pathology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Yoji
authors.initials: Y
authors.lastname: Nagashima
authors.affiliation: Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan;
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Kubota