“… 7 ) Similarly, the longer protrusion of the bird-beak increases the area receiving blood flow, which increases the likelihood of stent graft collapse. 4 , 8 ) According to SB-Kawasumi laboratories, Najuta’s oscillation linked with cardiac pulsation is a risk factor for stent graft collapse. In our case, there was no oscillation, but considering the fact that collapse occurred, the bird-beak was the direct cause of stent graft collapse.…”