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Example of persistent stenosis (group I-C 6-mm elliptical defect).
A, Angiogram obtained just after lesion creation shows a subadventitial hematoma that is compressing the arterial lumen.
B, Angiogram obtained 2 hours later shows that the subadventitial hematoma has spontaneously thrombosed, but it is still compressing the arterial lumen.
C, Angiogram obtained in the chronic stage shows that the stenosis has improved.
