從1985年3月到1990年12月，馬偕醫院泌尿外科為5091位病人做了5874次的座椅型經直腸超音波檢查，檢查的器官包括有膀胱、前列腺以及貯精囊；1024位病人膀胱的超音波檢查中377位患有膀胱癌占33%；3704位病人前列腺的檢查中有241位患有前列腺癌占6.5%，有2334位患有前列腺肥大占63%；363位病人貯精囊超音波的檢查中有8位受到腫瘤的侵犯占2.2%。從這種統計數字中顯示經直腸超音波對膀胱癌的診斷與分期(staging)是值得肯定的；對於前列腺肥大的診斷，手術前的評估以及手術後的追蹤有正面意義；同樣的它對於前列腺癌的分期相當明確有效，但是早期前列腺癌的診斷率只有22%是相當的偏低，表示經直腸超音波對於前列腺癌的診斷僅適合做參考作用；而貯精囊的超音波檢查顯示精血多為主精囊周圍相關器官發炎，惡性腫瘤比率很低。

From March 1985 to December 1990, there are 5091 patients being checked for 5874 times of chair type transrectal sonography exam-ination in Mackay Mamorial. The target organs include urinary bladder, prostatic gland & seminal vesicle. There are 337 bladder cancer being diag-nosed and staged in 1024 patients (33%). Also in 3704 patients. There are 241 patient of prostatic cancer (6.5%) and 2334 patients of benign prostatic hypertrophy (63%). The seminal vesicle was inveded by malignant tumour in 8 of 363 examined hemospermia patients (2.2%). From the above statistic deta,we confirm the positive function of transrectal Sonography in diagnosis & staging of bladder cancer. It is also valuable in diagnosis, pre-operative evaluation & post-operative follow up of benign prostatic hy-pertrophy. However, in early stage of prostatic cancer the diagnostic ratio is 22%. It means the echo machine is not so sensitive, and we can’s de-pend on it as the only tool to detect the pro-static cancer. Fine needle biopsy & PSA exami-nation is necessary. Most of the hemospermia patients have in-flammation of periseminal vesicle organ. The incidence of malignant tumor is very low. We conclude that transreatal sonography is convenient in mass screening of lower geni-tourinary organ including urinary bladder, pro-static gland and seminal vesicles. But it is most sensitive and accurate in detection of early pro-staitc cancer.