服部 一紀¹, 樋之津 史郎², 島居 徹², 内田 克紀², 赤座 英之², 小磯 謙吉²

Kazunori HATTORI¹, Shiro HINOTSU², Toru SHIMAZUI², Katsunori UCHIDA², Hideyuki AKAZA², Kenkichi KOISO²

¹猿島協同病院泌尿器科, ²筑波大学泌尿器科

¹Department of Urology, Sashima kyodo hospital, ²Department of Urology, Institute of Clinical Medicine, University of Tsukuba

キーワード : Intravesical Ultrasound Tomography, Miniature Probe, Bladder Cancer

Staging of bladder cancer is most important in determining treatment and formulating a prognosis. Transurethral ultrasound scanning is a useful method for staging bladder cancer. We studied transurethral ultrasound tomography with a roatating 7.5 MHz miniature probe (Olympus UM-1W) under cystoscopy to improve the accuracy of staging. Eighteen patients with bladder cancer (13 had superficial tumors and 5 invasive) were examined by this method. The scanner was inserted into the bladder through a working channel of a 25Fr cystoscope at the same time of transurethral resection of the tumor. Intravesical ultrasound tomography with a conventional probe (Aloka ASU-58) was also performed and the results compared with those obtained using a miniature probe. As a miniature probe could be applied close to the tumors and an ideal reflex could be produced, the sonograms using the miniature probe were superior to those using a conventional probe, especilay for small tumors. However, we could not precisely define tumor depth when the tumor extended beyond the muscle layer of the bladder. The correlation of the clinical T stage defined by ultrasound using a miniature probe to the pathological T stage was not different from that of the clinical T stage defined by ultrasound using a conventional probe. Although there are still some problems to be solved, this device should be able to improve transurethral endoscopic ultrasonography of the bladder and the upper urinary tract.