Atrial Dissection‐Like Appearance Caused by an Inferior Sinus Venosus Atrial Septal Defect with an Unroofed Defect

Abstract

Mini‐Abstract Atrial dissection is an uncommon entity and is generally associated with mitral valve interventions. However, atrial dissection‐like appearance has been also reported and atrial dissection might be considered as an important differential diagnosis. We present the interesting image of a left atrial dissection‐like appearance, which was actually caused by a dilated unroofed coronary sinus (CS) with inferior sinus venosus (SV)‐type atrial septal defect (ASD).Unexplained volume overload of right‐sided chambers should prompt for careful evaluation for SV type of ASD (superior or inferior), unroofed CS type of ASD, and partial anomalous pulmonary venous drainage.