Ascaris lumbricoides is the most common intestinal parasite to infect
humans. The incidence of ascariasis is increasing in our regions, due
to world travel and population migration. In one third of cases, the w
orm can enter the bile duct and cause cholangitis or biliary colics. D
iagnosis and treatment of ascariasis are discussed. Endoscopic retrogr
ade cholangio-pancreaticography (ERCP) with endoscopic extraction of t
he worm, using a Dormia basket, is a safe and effective procedure for
the diagnosis and treatment of biliary ascariasis. This technique serv
es as an effective alternative for surgery.