Pulmonary embolus and right atrial thrombus trapped in a patent foramen ovale is an unusual, rare condition. We report a case of impending paradoxical embolism with pulmonary embolism, in which a thrombus entrapped in a patent foramen ovale was detected. To our knowledge, this is the first case in the literature in which 'thrombus-in-transit' was detected in the right atrium both before and after entrapment in a patent foramen ovale.
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