[Ultrasonic scanning of the bile ducts in preventive examinations].

The results of the first experience in the use of ultrasonic investigation for primary diagnosis of some diseases of the gall bladder during mass screenings are analysed. Of 900 workers engaged in a factory diseases of the gall bladder (chronic cholecystitis, calculi and polyps of the gall bladder) were diagnosed in 171 (19%), of them in 15.5% the disease was first diagnosed, of these 8.7% without clinical signs. The method of ultrasonic investigation of the hepatoduodenal zone was discussed. A sonographic picture and the most typical sonographic signs of some diseases of the gall bladder were described.