Cor triatriatum sinister with dextrocardia in association with ostium secundum atrial septal defect, subpulmonary ventricular septal defect and bicuspid pulmonary valve in a pig

J Comp Pathol. 2023 Oct:206:13-16. doi: 10.1016/j.jcpa.2023.08.001. Epub 2023 Sep 22.


Necropsy of a 52-day-old Camborough pig revealed numerous cardiac malformations. The positional relationship of the atria, ventricles and great vessels was a mirror image type (I, L and L): inverted arrangement of the atria, with a left-sided right atrium and right-sided left atrium (situs inversus); inverted arrangement of the ventricles, with a left-sided morphological right ventricle and right-sided morphological left ventricle (L-loop); and aortic valve to the front left relative to the pulmonary valve (L-malposed). The major malformations included an ostium secundum atrial septal defect, cor triatriatum sinister (CTS), a subpulmonary ventricular septal defect and a bicuspid pulmonary valve. Histological examination revealed myocyte hypertrophy, focal myocardial necrosis and calcification in the left morphological right ventricle of the heart. To the best of our knowledge, this is the first report of CTS in pigs. Although the individual malformations found in the present case are not unique, an unusual combination of these cardiac malformations has not been described in animals.

Keywords: atrial septal defect; bicuspid pulmonary valve; cardiac malformation; congenital heart defect; cor triatriatum sinister; dextrocardia; pig; ventricular septal defect.

MeSH terms

  • Animals
  • Cor Triatriatum* / complications
  • Cor Triatriatum* / diagnosis
  • Cor Triatriatum* / veterinary
  • Dextrocardia* / complications
  • Dextrocardia* / veterinary
  • Heart Defects, Congenital* / veterinary
  • Heart Septal Defects, Atrial* / complications
  • Heart Septal Defects, Atrial* / diagnosis
  • Heart Septal Defects, Atrial* / veterinary
  • Heart Septal Defects, Ventricular* / complications
  • Heart Septal Defects, Ventricular* / diagnosis
  • Heart Septal Defects, Ventricular* / veterinary
  • Pulmonary Valve*
  • Swine
  • Swine Diseases*