Abstract 177: Follow-up Study of Thrombus in Coronary Aneurysms due to Kawasaki Disease.

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The features of MR coronary angiography (MRCA) are able to detect arterial walls and thrombus in aneurysms clearly by using the sequences of black blood methods.

Up to now 262 patients have been followed up by MRCA(the average 3.5 times ±2.3 times), The duration of the follow up is 4.7years±3.3years, During the periods, the coronary arterial lesions have changed as follows; decreased size of aneurysms in 116 patients out of the 262 (44.3%), enlargement of aneurysm in 2 (0.8%), newly appeared or progressed degree of localized stenosis in 26 (9.9%), appearance of occlusion in 5 (1.9%), recanalized vessels in 20 (7.6%). These changes are related to thrombus formation, thrombolysis and thickening of arterial walls.

The thrombus often change their locations in the aneurysm, sizes, even disappear and some of them develop to recanalized vessels.

Thin membranes in aneurismal lumen and tiny polyps on the intima were often detected (Fig),These constructions and thrombus in aneurysms are observed to be still changeable even more than 2 decades after the onset of Kawasaki disease.

Therefore, MRCA is the most convenient for following up CAL frequently and noninvasively.

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