Table 1. Summary of all ultrasonographic features evaluated during AU.

Gallbladder and biliary system	Gallbladder wall	Wall thickening >2 mm, irregular mucosal profile
	Gallbladder content	Biliary sludge (A), choleliths, subjectively overdistention
	Other gallbladder disorders	Mucocele (B), cystic mucinous hyperplasia
	Intrahepatic biliary tree	Intrahepatic biliary tree ectasia
	Extrahepatic biliary tree	Choleliths, extrahepatic biliary tree ectasia
Hepatic parenchyma	Dimensions	Subjectively increased or diminished
	Margins	Irregular or rounded
	Echogenicity	Increased or decreased
	Echostructure	Homogeneous or heterogeneous
	Parenchymal lesions	Anechoic, isoechoic, hypoechoic, hyperechoic
Gastrointestinal tract	Walls	Non-defined wall stratigraphy, transmural wall thickening, thickening of muscular or submucosa layer, mucosal hyperechoic linear striations or bright mucosal speckles intestinal segments, small intestinal mucosal hyperechoic band, bowel corrugation, gastric mucosa mineralization
	Content and peristalsis	Gas pattern, fluid pattern, decreased or ineffective peristalsis

(A) Biliary sludge classified according to Cook et al. (2016) criteria. (B) Mucocele classified according to Choi et al. (2016) criteria.