Why Right atrial appendage (RAA) is not prone for thrombus ? (poll 8220500)

Why Right atrial appendage (RAA) is not prone for thrombus ?

RAA is anatomically and hemodynamically closed structure

RAA has intrinsic active muscular contraction.

Right atrial contraction and SVC flow flushes the RAA with each beat

The question itself is wrong . RAA is indeed prone for thrombus like LAA

Other:

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