Key result
Case report identifies rare isolated bilateral PAPVR draining upper and right middle veins to RA.
Why the study?
Partial anomalous pulmonary venous return (PAPVR) presents with various morphologies, with left-sided and bilateral variants being less frequent and less well characterized.
Case Report
Highlights a rare anatomical variant of partial anomalous pulmonary venous return to improve recognition of complex congenital venous anomalies.
Alerts to rare bilateral PAPVR variants in evaluation; extends anatomic spectrum but leaves open prevalence and management implications.
Partial anomalous pulmonary venous return (PAPVR) is a rare congenital cardiac disease that can present with a variety of morphologies, most commonly involving the right upper pulmonary vein (RUPV) or right middle pulmonary vein (RMPV). Left-sided and bilateral variants are less frequent.1,2 These could be isolated or associated with other congenital lesions, most commonly sinus venosus defects and secundum atrial septal defects (ASDs). We report a rare variant of PAPVR in which the bilateral upper and the RMPVs drain anomalously into the right atrium (RA).
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Abdelhafiz et al. (2026) conducted a case report in Partial anomalous pulmonary venous return (PAPVR). A rare variant of isolated bilateral partial anomalous pulmonary venous return was identified where bilateral upper and right middle pulmonary veins drain anomalously into the right atrium.
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