Boas' or Boas's sign is hyperaesthesia (increased or altered sensitivity) below the right Hypochondrium or 12th rib region, which can be a symptom in acute cholecystitis (inflammation of the gallbladder).
Boas' sign refers to an increased sensitivity below the right hypochondrium or 12th rib region, which can be indicative of acute cholecystitis (inflammation of the gallbladder).