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A 35-year-old male with history of recurrent arrhythmias presented for pulmonary vein isolation. He underwent pre-procedural screening for thromboembolism risk with transesophageal echocardiogram. He had an incidental finding of a rare fenestrated membrane overlying his left atrial appendage. Additional work-up throughout his clinical course revealed genetic mutations in the LMNA and SNTA1 genes. There have been no previous reported genetic mutations reported in cases with LAA membranes.

This case report describes a rare case of ventricular septal defect due to non-penetrating trauma in a 43 year old male involved in a motor vehicle collision. The diagnosis was made by echocardiogram and the patient was taken immediately to the operating room for emergent surgical repair of the ventricular septal defect and survived.