Eisenmenger syndrome arising from aortopulmonary window diagnosed in adulthood: An unusual presentation as ischemic stroke

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Aortopulmonary window (AP window) is an uncommon congenital heart condition marked by a connection between the ascending aorta and the pulmonary trunk. Numerous individuals diagnosed with AP window typically manifest symptoms in their early childhood, which may include recurring respiratory tract infections due to a left-to-right shunt, signs of congestive heart failure, and, if not treated in early childhood, the condition can progress to severe pulmonary vascular disease and Eisenmenger syndrome. Without treatment, very few patients survive beyond their second decade of life. In this case, we present a patient who exhibited symptoms of an ischemic stroke while having an undiagnosed large AP window and Eisenmenger syndrome.