Diagnostic Image: Abdominal Ultrasound (US). Modality: B-mode sonography of the Right Upper Quadrant (RUQ) in the supine longitudinal plane. Anatomical Region: Gallbladder and adjacent liver parenchyma. Findings: The gallbladder lumen contains multiple well-defined, hyperechoic structures consistent with cholelithiasis (gallstones). These structures exhibit prominent posterior acoustic shadowing, a characteristic feature of mineralized calculi. Calipers measure the gallbladder length at 7.1 cm and the anteroposterior (AP) diameter at 1.9 cm, both of which fall within normal physiological limits. There is no visible evidence of gallbladder wall thickening or pericholecystic fluid in this view. Clinical Significance: The image demonstrates uncomplicated cholelithiasis, providing a classic example of gallstones for educational purposes in gastroenterology and radiology. Target Audience: Medical students and residents learning ultrasound interpretation of the biliary system.

This diagnostic image is an abdominal ultrasound in the right upper quadrant demonstrating a scleroatrophic gallbladder. The primary visual finding is a shrunken, contracted gallbladder lumen that is largely replaced by echogenic material. Hyperechoic (bright) structures, indicated by white arrows, represent multiple gallstones (cholelithiasis) densely packed within the organ. A prominent posterior acoustic shadow, labeled as 'SOMBRA', is visible distal to the calculi, a hallmark sonographic sign of gallstones. The image illustrates chronic cholecystitis leading to a 'Wall-Echo-Shadow' (WES) sign or scleroatrophic appearance, where the gallbladder wall and the echo from the stones are closely apposed. This finding is of high clinical significance in hepatobiliary imaging as it confirms cholelithiasis in a chronically diseased, contracted gallbladder, which can complicate surgical interventions such as cholecystectomy.

This abdominal ultrasonography image demonstrates the gallbladder in a patient with cholelithiasis. The primary findings consist of multiple hyperechoic structures (indicated by black arrows) within the gallbladder lumen, consistent with cholelithiasis (gallstones). These stones exhibit high echogenicity and are accompanied by prominent posterior acoustic shadowing, a hallmark diagnostic feature of dense calcified structures on ultrasound. The gallbladder wall appears thickened, suggesting underlying inflammation or cholecystitis. The surrounding liver parenchyma shows a relatively homogeneous echotexture, providing a clear acoustic window for the gallbladder. This diagnostic image is used to assess biliary pathology and plan clinical interventions such as percutaneous transhepatic gallbladder drainage (PTGBD). The orientation is shown via the body habitus icon in the bottom-left corner, indicating a right upper quadrant scan. This visual serves as a primary tool for medical students and clinicians to identify the classic sonographic presentation of gallstones and associated pericholecystic changes.

This diagnostic image is a 2D grayscale abdominal ultrasound focusing on the gallbladder (labeled 'GB'). The gallbladder is visualized as an anechoic (black) fluid-filled sac. Within the dependent portion of the gallbladder lumen, there are multiple hyperechoic (bright) mobile structures consistent with cholelithiasis (gallstones). These stones demonstrate posterior acoustic shadowing, a hallmark diagnostic feature where the sound waves are blocked by the dense stones. The gallbladder wall appears thin and regular, without obvious evidence of wall thickening, pericholecystic fluid, or other signs of acute cholecystitis. In the clinical context of situs inversus totalis, this ultrasound identifies the gallbladder positioned on the left side of the upper abdomen. This visual serves as a primary diagnostic tool for evaluating biliary colic and symptomatic cholelithiasis.

This diagnostic image is a gray-scale ultrasound of the right upper quadrant (RUQ) showing the gallbladder (GB) in a supine position. The visual focus is on the gallbladder lumen, which contains multiple distinct, hyperechoic (bright) foci. These structures exhibit classic posterior acoustic shadowing, where ultrasound waves are blocked, confirming the presence of cholelithiasis (gallstones). The gallbladder itself is non-distended. The gallbladder wall appears thin and smooth, measuring approximately 3 mm, which is within the normal physiological range. There is a notable absence of sonographic signs associated with acute cholecystitis, such as gallbladder wall thickening, pericholecystic fluid, or wall hyperemia. The adjacent hepatic parenchyma is visible but unremarkable. This image serves as a clinical example of symptomatic or asymptomatic cholelithiasis without secondary inflammatory changes of the gallbladder wall.