Polygon-like luminal configuration captured by intracoronary optical frequency domain imaging of a spontaneous coronary spasm in an ST-elevation myocardial infarction patient. Issue 4 (June 2019) - Takei, Yosuke; Mori, Hiroyoshi; Sone, Hiromoto; Tashiro, Kazuma; Sasai, Masahiro; Sato, Tokutada; Suzuki, Hiroshi