Ultrasound Animal Challenge 1 – Answer

The correct answer to the question "What is the Tiger-stripe sign?" is:

B) A high amplitude Doppler signal caused by oscillating structures

The Tiger-stripe sign (also called Zebra sign) can be seen on Doppler as reputative high amplitude parallel signals. They are typically seen in the presence of high oscillating structures (masses, cords or valves). Flail leaflets with mitral regurgitation is a common cause of the Tiger stripe sign. You can also hear the oscillation of your stethoscope (or with Doppler). The sound resembles the cry of a seagull. 

Yours,
Thomas Binder and the 123sonography team