Mechanism of a reproducible accordion phenomenon: insights by optical coherence tomography visualization.

Pseudostenosis or 'accordion phenomenon' is a transient angiographic multifocal filling defect observed mostly during percutaneous coronary intervention, mainly in tortuous vessels. We describe a case of a reproducible accordion effect in the right coronary artery accompanied by only a mild clinical syndrome. Optical coherence tomography evaluation of this strange and fortunately completely reversible phenomenon is discussed.