The Chiari network in an echocardiography student.

Figure 1. Parasternal short-axis systolic frame at the level of the aortic valve. The Chiari network is located in the posterior right atrium. Although precise attachment sites could not be identified, real-time imaging suggested constrained motion near the interatrial septum. RA = right atrium; RV = right ventricle. pentine highly mobile reflective structure was noted in the right atrium (RA). By parasternal longand short-axis views it appeared to whip toward the posterior aspect of the right atrium during systole, and then prolapse across the tricuspid annulus during diastole (Figs. 1 and 2). From these views as well as apical (Fig. 3) and subcostal (Fig. 4) views, the mass moved in and out of the scan plane. The structure was constrained near the orifice of the inferior vena