Fig. 1

Image panel showing angiography and CMR perfusion of patient with left main stem (LMS) disease. Panel a shows angiography with a critical distal LMS lesion. The corresponding mid-slice CMR stress perfusion (b) demonstrates a perfusion defect in septum, anterior and lateral wall. Myocardial curves (c) of the same mid ventricular slice demonstrates hypoperfusion in the segments subtended by the LMS. Orange and red lines represent the inferior and infero-lateral segments respectively and show higher signal intensity corresponding with no hypoperfusion in these segments