Assessment of the size and number of gallstones is important in the external shock wave lithoripsy. The authors retrospectively analyzed 69 sonograms and 25 oral cholecystograms in terms of size and medmber of gallstones and compared with gallstones removed at surgery. Teh size and number of gallstones were correct ly diagnosed in 41%(28/69) by sonography and 54%(7/13) by oral cholecystography When stones were multiple, the assessment of the size and number were difficult, sonogrm being correct in 11%(2/18)and oral cholecystogram being correct in 66%(2/3). On the basis of our results, painstaking examination is necessary in the evaluation of gallstones in patients undergoing external shock wave lithotripsy.
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