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Figure 1: In panel a, an overhanging membrane-like ridge is demonstrated in the mid esophageal view of 2-dimensional transesophageal echocardiography (TEE). The white arrow indicates a ridge-like structure. AS - atrial septum; RA - right atrium; LA - left atrium; AA - ascending thoracic aorta. In panel b, superiorly coursing membrane-like ridge in the left atrium is demonstrated in the en face surgeon's view (looking at the supine patient from head to toe from the left side of the patient) with full-volume 3-dimensional TEE. The black arrow indicates a ridge-like structure. The arrow heads denote the spatial orientation. LA - left atrium; RA - right atrium; AV - aortic valve; OF - oval fossa; SVC - superior vena cava; Ant - anterior side of the patient; Rt - right side of the patient; *stitch artifact due to respiratory motion. In panels c and d, a folding membrane-like character creating a slit of the ridge structure (black arrow) is demonstrated in 3-dimensional TEE. The arrow heads denote the spatial orientation. AS - atrial septum; RA - right atrium; LA - left atrium; OF - oval fossa; ant, anterior side of the patient; rt - right side of the patient; sup - head side of the patient; inf - back side of the patient

Figure 1: In panel a, an overhanging membrane-like ridge is demonstrated in the mid esophageal view of 2-dimensional transesophageal echocardiography (TEE). The white arrow indicates a ridge-like structure. AS - atrial septum; RA - right atrium; LA - left atrium; AA - ascending thoracic aorta. In panel b, superiorly coursing membrane-like ridge in the left atrium is demonstrated in the en face surgeon's view (looking at the supine patient from head to toe from the left side of the patient) with full-volume 3-dimensional TEE. The black arrow indicates a ridge-like structure. The arrow heads denote the spatial orientation. LA - left atrium; RA - right atrium; AV - aortic valve; OF - oval fossa; SVC - superior vena cava; Ant - anterior side of the patient; Rt - right side of the patient; *stitch artifact due to respiratory motion. In panels c and d, a folding membrane-like character creating a slit of the ridge structure (black arrow) is demonstrated in 3-dimensional TEE. The arrow heads denote the spatial orientation. AS - atrial septum; RA - right atrium; LA - left atrium; OF - oval fossa; ant, anterior side of the patient; rt - right side of the patient; sup - head side of the patient; inf - back side of the patient