Which imaging modality is excellent for examining the liver and gallbladder?

• A. Echocardiography
• B. Sonography
• C. Vascular sonography applications
• D. Bone densitometry

Answer: (B)

Ultrasound (sonography) is the imaging modality of choice for the liver and gallbladder because it provides real-time, high-resolution images of both organs without radiation. It excels at detecting gallstones and assessing the gallbladder for wall thickening, inflammation, or pericholecystic fluid, as well as evaluating the biliary ducts for dilation or obstruction. For the liver, it can visualize parenchymal changes such as fatty infiltration, cirrhosis, and focal lesions, and with Doppler it can assess hepatic blood flow. It’s quick, widely available, noninvasive, and cost-effective, making it the first-line study for hepatobiliary evaluation. Limitations include being operator dependent and potentially limited by body habitus or overlying gas, in which case CT or MRI may provide additional detail.