[Ascaris in bile ducts. Value of ultrasonic diagnosis].

Results of ultrasound imaging in 4 cases of ascaris migration into biliary tract are described. Certain aspects are typical of the nematode in the biliary ducts: triple line image, spaghetti appearance, mobility of image. Other important diagnostic ultrasound features are the labile and changing character of direct and indirect signs of the parasitic wandering of the worm. These findings provide ultrasonography with advantages over other methods of biliary tract exploration, less reproducible and heavier.