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J Korean Soc Radiol. 2018 Jul;79(1):33-39. Korean. Original Article.
Nam YK , Kim SH , Kim MJ , Lee HJ , Cho SH .
Department of Radiology, Keimyung University, Dongsan Hospital, Daegu, Korea.
Department of Radiology, Kyungbook National University Hospital, Daegu, Korea.


To prospectively assess the diagnostic potential of computed tomography urography (CTU) as a prior examination in the detection of bladder cancer.

Materials and Methods

A total of 3280 CTU examinations were assessed in 3050 consecutive patients. Patients who were over 35 years of age, with gross hematuria, persistent microhematuria, or a history of urothelial tumor, were included in our study. Our study investigated the diagnostic capability of CTU over the course of two prior examinations. After the first examination, patients with a definite lesion observed by CTU were referred directly for rigid cystoscopy (RC) and patients with negative or probable lesion were referred for flexible cystoscopy (FC). After the second examination, patients with a definite lesion observed by CTU were referred directly for RC, patients with probable lesion were referred for FC, and patients with negative lesion were referred for clinical follow-up. Performance characteristics for the two prior examinations were determined by using pathologic findings or clinical follow-up as the reference standard.


The overall sensitivity, specificity, accuracy, positive predictive value, and negative predictive value for detecting bladder cancer were 95.2%, 95.4%, 95.4%, 69.1%, and 99.2%, respectively, for the first prior examination, and 93.4%, 93.3%, 93.3%, 61.1%, and 98.4%, respectively, for the second prior examination.


CTU as a prior examination is accurate for the early detection of bladder cancer. Notably, when used as a second prior examination, CTU could help to avoid the unnecessary use of FC in patients with negative lesions.

Copyright © 2019. Korean Association of Medical Journal Editors.