Abstract

1. Abstract
Chiari’s network is an embryological vestige of the right valve of the sinus venosus. It is described as a fenestrated membranous or reticular net-like structure occasionally present in the right atrium, near the opening of the inferior vena cava and coronary sinus. While often considered a normal anatomical variant and clinically insignificant, it might cause cardiological manifestations in infants and adults. We present the case of a newborn with a Chiari network causing persistent cyanosis due to an interatrial right-to-left shunting through the patent foramen ovale, followed later by supraventricular tachycardia.