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Initial CT KUB showed focal renal swelling thus CT angiogram was performed.
Wedge-shaped region of non-enhancement with filling defect in the anterior segmental branch of the left renal artery consistent with infarction. These clots are usually embolic in aetiology but no cardiac source was found. A patent foramen ovale was eventually detected by "bubble" echocardiography, i.e. paradoxical thromboembolism