Postmortem magnetic resonance imaging findings of tricuspid atresia with ventricular and atrial septal defects and subvalvular pulmonic stenosis in a Japanese native Noma horse

Kenji Kutara; Sho Kadekaru; Keiichi Hisaeda; Keisuke Sugimoto; Tetsushi Ono; Yoichi Inoue; Shinichi Nakamura; Ryohei Yoshitake; Emi Ohzawa; Akira Goto; Eri Iwata; Kenichi Shibano; Yumi Une; Hitoshi Kitagawa

doi:10.1294/jes.34.121

Postmortem magnetic resonance imaging findings of tricuspid atresia with ventricular and atrial septal defects and subvalvular pulmonic stenosis in a Japanese native Noma horse

J Equine Sci. 2023 Dec;34(4):121-125. doi: 10.1294/jes.34.121. Epub 2024 Jan 18.

Authors

Affiliations

¹ Faculty of Veterinary Medicine, Okayama University of Science, Ehime 794-8555, Japan.
² Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan.
³ Noma Horse Preservation Society, Ehime 794-0082, Japan.

Abstract

The necropsy of a 2-day-old Noma horse that died of weakness showed an enlarged cardiac base and a narrow cardiac apex, suggesting cardiac malformation. The excised heart underwent imaging to investigate its luminal structure. On three-dimensional magnetic resonance imaging, the right atrium and right ventricle were discontinuous. The right atrium communicated with the left atrium and the left ventricle communicated with the right ventricle. The lumen narrowed near the pulmonary artery valve. Since the same findings were observed on gross examination, the foal was diagnosed with tricuspid atresia with ventricular and atrial septal defects, along with subvalvular pulmonic stenosis.

Keywords: 3D MRI; Noma horse; tricuspid atresia.