RADIATION METHODS FOR REVEALING THE LOCAL IZATION OF INSULINOMA OF THE PANCREAS

Thirty-one patients with insulinoma of the pancreas verified during op eration were examined. The localization of the tumor was detected by u ltrasonic examination in 9.7 %, by X-ray computed tomography in 38.9 % , by angiographic study in 32.1 %, and by endoscopic retrograde pancre atocholangiography in 11.1 % of cases. Complex use of the methods allo wed the localihation of the tumor to be determined in 48.4 % of cases. The smallest diameter of insulinoma diagnosed during ultrasonic exami nation and endoscopic retrograde pancreatocholangiography was 1.5 cm, X-ray computed tomography and angiography demonstrated tumors measurin g 1.0 cm in diameter. The diagnostic efficacy of the methods increases when the tumor is located in the body and tail of the pancreas. The e xamination scheme for patients with suspected insulinoma must include ultrasonic study and X-ray computed tomography; when their results are negative angiography must be resorted to.