Kongsayreepong, S. and Janyong, P. 2025. Platypnea and orthodeoxia syndrome due to a right-to-left shunt via the foramen ovale in the absence of pulmonary hypertension after orthotopic liver transplantation: Sequelae leading to brain abscess: A case report: Reopening foramen ovale in the absence of pulmonary hypertension causes POS and brain abscess after orthotopic liver transplantation. Clinical Critical Care. 33, 1 (Jul. 2025), e250017. DOI:https://doi.org/10.54205/ccc.v33.273699.