CTICasesProbe-Patent Patent Foramen Ovale
Imaging findings
Sagittal and axial CT images demonstrate a small, incidental slit-like communication in the interatrial septum between the ostium primum and secundum, without active left-to-right contrast shunting.
Key takeaways
A probe-patent patent foramen ovale (PFO) is a common incidental finding present in approximately 25% of the general population. It is usually closed by left atrial pressure but can open and allow right-to-left shunting in the setting of acutely elevated right heart pressures, such as during a massive pulmonary embolism.
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