Oral cholecystography after ingestion of the 3.0 gr. Sodium tyropanoate (Bilopaque) was done in 504 patients from January 1983. Simple supine views of the abdomen of the abdomen of 37 patients, in whom the gall bladder was either nonvisualized or faintly visualized upto 17 hours after Bilopaque administration, were reviewed in search of the presence of conjugated material in the bowel. The results were as follows: 1. The ratio of male to female was nearly 2:3, and age distribution was even from 20 years to 79 years. 2. Among 26 cases which showed conjugated Bilopaque in the bowel, cholecystitis was 3 cases (28%) and clonorchis sinensis, salmonellosis, pancreatitis, acute gastritis was 2 cases (13%) respectively. 4. All of the 20 cases of cholecystitis with stone showed conjugated Bilopaque in the bowel. 5. Among 6 cases of which conjugated Bilopaque in the bowel, salmonellosis was 1 case (17%) and remaining 5 cases (83%) were acalculus cholecystitis. 6. The results of our study show that the presence of conjugated Bilopaque in the bowel in nonvisualized or faintly visualized gall bladder after oral cholecystography is of definite indicative of cholecystitis. 7. Surgical intervention or ultrasonographic examination of the gall bladder without double dose or second dose oral cholecystography on such cases is recommended.