Ureteroscopy-Assisted Biopsy for a Retroperitoneal Tumor: A Case Report.
BACKGROUND
Retroperitoneal tumor is often seen in urology clinical practice. To diagnose the tumor, tumor specimens must be obtained. However, in some cases, the tumor is penetrated by vessels around the ureter, and it may be difficult to detect the optimal spot for obtaining a specimen, even when performing open surgery.


METHODS
A 53-year-old male patient was referred to our hospital for further examination of left back pain due to hydronephrosis. Enhanced computed tomography demonstrated ureter stenosis in front of the ilium, which was surrounded by a retroperitoneal tumor. The tumor was penetrated by blood vessels; therefore, we performed an open surgical biopsy on the suspicion of a retroperitoneal tumor using ureteroscopic assistance. The diagnosis of idiopathic retroperitoneal fibrosis was made according to the biopsy.


CONCLUSIONS
We herein report the first case of a ureteroscopy-assisted biopsy for the pathological diagnosis of a retroperitoneal tumor.
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Yoko
Y
Maeda
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan ; Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
Takashi
T
Kawahara
Department of Pathology, Yokohama City University Medical Center, Yokohama, Japan.
Mikiko
M
Tanabe
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Yohei
Y
Kumano
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Mari
M
Ohtaka
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Takuya
T
Kondo
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Taku
T
Mochizuki
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Yusuke
Y
Hattori
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Jun-Ichi
J
Teranishi
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Yasuhide
Y
Miyoshi
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Yasushi
Y
Yumura
Department of Pathology, Yokohama City University Medical Center, Yokohama, Japan.
Yoshiaki
Y
Inayama
Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
Masahiro
M
Yao
Department of Urology and Renal Transplantation, Yokohama City University Medical Center, Yokohama, Japan.
Hiroji
H
Uemura
Retroperitoneal fibrosis; Retroperitoneal tumor; Ureteroscopy