case_images: PMC10161294_01
case_images: Schematic diagram. (Reproduced with permission from Tutschek et al.
  
   Copyright John Wiley and Sons.). Abbreviations: CTS-M, cor triatriatum sinister membrane; LACV, levoatrial cardinal vein; ALA, accessory left atrium; ASD, atrial septal defect; LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle; MV, mitral valve; TV, tricuspid valve; SVC, superior vena cava; Inn. Vein, innominate vein.
case_images: 10.1177_23247096231171247-fig1.jpg
case_images: PMC10161294_01_10.1177_23247096231171247-fig1.jpg
case_images: fig1-23247096231171247
case_images: An echocardiogram was performed, which demonstrated LCT with a tiny jet of prograde flow across the CTS membrane from the proximal to distal LA chambers (Figures 1 and 2). The right ventricle was dilated but maintained normal systolic function (see Figures 1 and 2).
case_images: Apical 4-chamber echocardiographic view showing cor triatriatum membrane (yellow arrow) in the left atrium.
case_images: 10.1177_23247096231171247-fig2.jpg
case_images: PMC10161294_01_10.1177_23247096231171247-fig2.jpg
case_images: fig2-23247096231171247
case_images: An echocardiogram was performed, which demonstrated LCT with a tiny jet of prograde flow across the CTS membrane from the proximal to distal LA chambers (Figures 1 and 2). The right ventricle was dilated but maintained normal systolic function (see Figures 1 and 2).
case_images: Apical 4-chamber view with color Doppler, showing severely restricted flow across the cor triatriatum membrane (green arrow).
case_images: 10.1177_23247096231171247-fig3.jpg
case_images: PMC10161294_01_10.1177_23247096231171247-fig3.jpg
case_images: fig3-23247096231171247
case_images: There was a decompressing LACV draining to a dilated innominate vein (Figures 3 and 4).
case_images: Large decompressing levoatrial cardinal vein (green arrows) arising from left atrium (labeled LA) and draining to the innominate vein superiorly (not shown).
case_images: 10.1177_23247096231171247-fig4.jpg
case_images: PMC10161294_01_10.1177_23247096231171247-fig4.jpg
case_images: fig4-23247096231171247
case_images: There was a decompressing LACV draining to a dilated innominate vein (Figures 3 and 4).
case_images: PMC10161294_02