Chiari Network-Induced Tricuspid Valve Obstruction.

We present a case of a 5-day-old neonate exhibiting lip cyanosis and hypoxemia, with a percutaneous oxygen saturation of 74%, as the primary clinical manifestations. Echocardiography and intraoperative examination revealed an abnormally elongated Chiari network obstructing the tricuspid valve orifice. This case highlights the clinical importance of anatomical variations in the Chiari network, which, although generally a benign embryological remnant, can lead to hemodynamic disturbances necessitating prompt identification in neonatal cardiology assessments.