identify by hypoechoic "shadowing" behind hyperechoic stones
if no shadowing, may be polyps, sludge, etc.
SIN Sign: Stone in neck
Measure from inner to inner
Pain with<unk>  probe palpation over gallbladder
Biliary ultrasound
Ultrasound: Abdomen
Liver function tests
GI antibiotics
Gastric lavage
Acute abdominal series
Paracentesis
Diagnostic peritoneal lavage