Chiari network

(Hans Chiari, 1851-1916, Austrian pathologist), a right atrial embryonic remnant consisting of a membrane extending from the region of the ostia of the inferior vena cava and coronary sinus to the atrial septum and tricuspid annulus. It is depicted as a normal variant on echocardiography in less than 5% of subjects and has sometimes been misinterpreted as a thrombus, vegetation or tumour in the right atrium. Portions of the network may also be depicted on MRI.

CBH