Gallbladder neoplasm seen on contrast-enhanced ultrasound

The first panel demonstrates the gallbladder on transcutaneous B-mode ultrasound. Contrast-enhanced ultrasound is performed to differentiate between gallbladder sludge and neoplasia (second panel). In the arterial phase of contrast enhancement, gallbladder neoplasms are typically enhancing (area between plus signs), whereas sludge is nonenhancing.