Mo1474 Detection of Omental Metastases by EUS FNA: Impact on CT/MRI Staging and Resectability

evaluation) were assessed in patients who were judged as hypovascular in CECT. Results: All patients with SPNs and 11 patients with NENs were diagnosed as hypovascular based on the definition of weak contrast effect of tumors compared with surrounding parenchyma in arterial phase. When we diagnosed hypovascular in CECT as SPNs, sensitivity, specificity and accuracy were 100%, 69%, 77%, respectively. Seven of 11 patients with SPNs and 2 of 11 patients with NENs had a rapidly falling off appearance in echo intensity within one minute, and when we diagnosed a rapidly falling off appearance as SPNs, sensitivity, specificity and accuracy were 63%, 82%, 73%, respectively. All patients with SPNs depicted a focally colored-signal type and 7 of 11 patients with NENs were a diffusely colored-signal type, and when we diagnosed a focally colored-signal type as SPNs, sensitivity, specificity and accuracy were 100%, 64%, and 82%, respectively. The TIC-based quantitative analysis revealed an only echo intensity velocity ratio of elevation as a significantly different parameter between SPNs and NENs. When we diagnosed echo intensity velocity ratio of elevation!1.294 as SPNs, sensitivity, specificity and accuracy were 89%, 80%, 84%, respectively. Combination of these three findings of CE-EUS enabled sensitivity, specificity and accuracy to rise up to 100%, 82%, 90%, respectively. Conclusions: CEEUS was useful in the differential diagnosis between SPNs and NENs providing novel vascular information.