The authors describe a case with an internal mammary artery (IMA) graft that demon strated prolonged, but reversible, luminal narrowing persisting > twenty-four hours following percutaneous transluminal angioplasty. Luminal narrowing disappeared spon taneously, however, at the time of follow-up angiography one week after the angioplasty. Since haziness at the dilation site had been shown on preprocedural angiogram, sugges tive of intraluminal thrombus, this phenomenon may be attributed to either prolonged vasospasm or distal embolization of the IMA graft.
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