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[Accordion effect--a rare pseudocomplication of coronary angioplasty. A case report].

Accordion effect is a rare pseudocomplication of coronary angioplasty created by straightening of tortuous coronary artery with a guidewire. Its morphology is nearly identical with vessel dissection, spasm or thrombosis but no special treatment is needed. Immediate and correct diagnosis of accordion effect prevents consequences of unnecessary dilatation of normal coronary segment.