Leftward deviation of the primary septum or dividing left atrial shelf?

Hubrechts, Jelena;Pollenus, Julie;Gewillig, Marc
(2021) Cardiology in the young — Vol. 31, n° 12, p. 1893-1900 (2021)

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Abstract
Isolated leftward prolapse or deviation of the primary atrial septum is a rare CHD that can mimic abnormal pulmonary venous return at first sight. We present a case of a newborn infant, referred for surgical correction of totally anomalous pulmonary venous return into the right atrium, with the peri-operative finding of a leftward deviation of the superior margin of the primary atrial septum. The distinction with a dividing atrial shelf could not be confirmed with certainty. Fifty-three similar cases from the literature are incorporated. A detailed review of the current account on atrial septation is studied. The embryological and clinical features of a dividing partition of the left atrium are discussed.
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Hubrechts, J., Pollenus, J., & Gewillig, M. (2021). Leftward deviation of the primary septum or dividing left atrial shelf? Cardiology in the young, 31(12), 1893-1900. https://doi.org/10.1017/S1047951121004418 (Original work published 2021)