Keywords : Abdominal Ultrasound, acute cholecystitis, Adenomyomatosis, comet tail artifact, compound imaging, duplicated gallbladder, ectopic gallbladder, emphyesematous cholecystitis, focal zone, gallbladder carcinoma, gallbladder polyps, gallbladder septation, gallbladder sludge, GALLBLADDER, gallstone, interlobar fissure, left lateral decubitus, ligamentum teres, LLD, partial gallbladder duplication, Phrygian cap, porcelain gallbladder, Rokittansky-Ashoff sinus, Society of Radiologists in Ultrasound, SRU, thickened gallbladder wall, wall echo shadow complex, WES