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Radiology, Vol 193, 239-245, Copyright © 1994 by Radiological Society of North America

ARTICLES

Bladder tumor staging: comparison of contrast-enhanced CT, T1- and T2- weighted MR imaging, dynamic gadolinium-enhanced imaging, and late gadolinium-enhanced imaging

B Kim, RC Semelka, SM Ascher, DB Chalpin, PR Carroll and H Hricak
Department of Radiology, University of California, San Francisco 94143- 0628.

PURPOSE: To evaluate the accuracy of contrast material-enhanced computed tomography (CT), unenhanced T1- and T2-weighted magnetic resonance (MR) imaging, and dynamic gadolinium-enhanced spoiled gradient-echo MR imaging in the staging of bladder cancer. MATERIALS AND METHODS: Thirty-six patients with histologically proved bladder cancer were prospectively examined with CT and MR imaging before tumor resection. Images were evaluated in a blinded fashion. RESULTS: All methods depicted tumors comparably well. Staging was correct in 16 of 29 patients (55%) with CT and 27 of 36 patients (75%) overall with MR imaging. Overstaging was the most common error, and both CT and MR imaging were more accurate for higher-staged tumors. CONCLUSION: CT and MR imaging perform well in the detection of tumors but are less accurate in staging. Dynamic gadolinium-enhanced MR imaging is better than other techniques, but the difference is not statistically significant.


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