Cholangitis is an infection of the biliary tract with the potential to cause significant morbidity and mortality. Many patients with acute cholangitis respond to antibiotic therapy; however, patients with severe or toxic cholangitis may not respond and may require emergency biliary drainage. Jean M. Charcot recognized this illness in 1877 when he described a triad of fever, jaundice, and right upper quadrant pain. In 1959, Reynolds and Dargon described a more severe form of the illness that included the additional components of septic shock and mental confusion, which is referred to as the Reynolds pentad.