What is typically seen in a normal gallbladder on ultrasound?

In a normal gallbladder on ultrasound, the presence of a clear anechoic lumen is a key characteristic observed. The gallbladder's lumen is filled with bile, which appears dark or anechoic on ultrasound images. This indicates that there are no solid masses or pathologies interfering with the normal appearance of the gallbladder.

The clear anechoic appearance signifies that the gallbladder is functioning properly without any abnormalities like cholecystitis or gallstones, which would alter the echo texture and create an abnormal appearance. Observing a clear lumen is essential for confirming the gallbladder's health and normal function during an ultrasound examination.