Figure 4: (Case 3) (a) Initial angiography demonstrating a coronary artery aneurysm at the proximal segment of the major diagonal branch. (b) Severe stenoses at both entry and exit of the aneurysm (arrows). (c) An attempt of ordinary antegrade guidewire insertion to the diagonal branch. (d) Schema of the bifurcation and the guidewire forming a loop in the aneurysm. (e) Sequential images while performing the DLC-facilitated reverse wire technique. (f) Schema of the bifurcation and the guidewire advancement to the distal diagonal branch beyond the stenosis at the exit of the aneurysm. (g) Final angiography showed adequate vessel dilation and blood flow. DLC: Dual-lumen catheter