Endoscopic Repair of Obstructive Cor Triatriatum

•CTS is characterized by a membrane that divides the left atrium into two chambers.•This patient also presented with mitral regurgitation.•The authors present multimodality images and intraoperative video clips.•In this case, repair was performed with a minimally invasive approach.•Intraoperative echocardiography is an essential element of patient care.