"Wall Echo Shadow" <unk> 
Consists of two parallel hyperechoenic lines (Wall) separated by a hypoechoic space (Echo), and distal shadowing (Shadow) from the gallstone.
Typically observed in patients with a contracted gallbladder around a single large gallstone
Patients with multiple gallstones can also produce the finding if the gallbladder is contracted around them
Can also be seen in a "porcelain gallbladder"
The<unk>  can distinguish a gallstone from a loop of bowel when the entirety of the gallbladder is not visible due to the large shadowing.
Typically observed in patients with a contracted gallbladder around a single large gallstone
Patients with multiple gallstones can also produce the finding if the gallbladder is contracted around them
Can also be seen in a "porcelain gallbladder"
WES sign
Faget sign
Beers criteria
Broselow color zones
Wells criteria
De Winter's T waves
Sgarbossa's criteria
Ottawa ankle rules