The ratio of superior mesenteric artery diameter to superior mesenteric vein diameter based on non-enhanced computed tomography in the early diagnosis of spontaneous isolated superior mesenteric artery dissection

Yuan-li Lei, Wen-xing Song, Yi Lin, Hui-ping Li, He-ping Lyu, Jiao-zhen Chen, Zhang-ping Li, Jia-na Yin, Ji-ke Xue, Shou-quan Chen

Figure 1. ROC curves. ROC curves showing the AUC, cut-off, sensitivity and specificity of the maximum SMA diameter (A), SMA/SMV (B), combined parameters of maximum SMA diameter and perivascular exudation (D), SMA/SMV and perivascular exudation (E), and SMA/SMV and maximum SMA diameter (G). In the diagnostic efficiency aspect, SMA/SMV was better than the maximum SMA diameter (P<0.001, C). The combined parameters of SMA/SMV and perivascular exudation were better than the maximum SMA diameter and perivascular exudation (P<0.05, F); the combined parameters of SMA/SMV and maximum SMA diameter were the best (P<0.05, H). If the value of the maximum SMA diameter was X (mm), SMA/SMV was Y, and perivascular exudation was Z (if have, Z=1; if not, Z=2), then the value of X+Z = -17.418+1.602*X+1.135*Z; the value of Y+Z = -16.718+19.016*Y+0.928*Z; and the value of X+Y = -23.742+1.012*X +15.624*Y. ROC: receiver operating characteristic; AUC: area under the curve; SMA: superior mesenteric artery; SMA/SMV: the ratio of the SMA diameter to the superior mesenteric vein diameter.