CTICasesAdult Ostium Primum Atrial Septal Defect
Imaging findings
CT angiogram in a 56-year-old male shows a large ostium primum atrial septal defect at the lower portion of the interatrial septum, with mixed contrast density indicating a significant left-to-right shunt. Radiograph shows shunt vascularity.
Key takeaways
Ostium primum ASDs are less common than ostium secundum defects and are located inferiorly, often associated with endocardial cushion defects. They can occasionally remain asymptomatic and present in adulthood with pulmonary hypertension.
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