EP-210Introduction: Our aim is to explore the diagnostic value of the new approach of pancreatic cancer (PC) diagnosis in patients with chronic pancreatitis (CP) by mathematical postprocessing of multidetector 128-row computed tomography (MDCT) results. Methods: We analyzed results of contrast-enhanced MDCT from 122 patients with CP: 71 (58.2%) males and 51 (41.8%) females, mean age 53.7 ± 13.03 (30-83), who underwent MDCT from January 2018 to October 2019. All cases were pathologically proved by core-biopsy or surgery. We calculated median of enhancement gradient in Hounsfield units (HU) between region of interest and intact parenchyma (Mgrad) based on multiphase MDCT results. Correlation assessed by Pearson's correlation coefficient (r). The ROC curves were performed to evaluate diagnosis potential of Mgrad. Results: There were 46 (37.7%) patients with PC and 76 (62.3%) patients with only CP. Mean Mgrad value was higher in PC-group -26.5 ± 8.6 HU than in CP-group -13.9 ± 5.1 HU (р = 0.0001); Mgrad cut-off value for PC was 20 HU (p = 0.001). There was positive correlation of Mgrad in patients with PC (r = 0.68, p = 0.0001) and negative correlation in patients with CP (r = -0.68, p = 0.0001). Sensitivity, specificity, accuracy, positive and negative predictive value of PC diagnosis were 89.1%, 96.1%, 93.4%, 93.2%, 93.6% for Mgrad and 69.5%, 92.1%, 83.6%, 84.2%, 83.3% for MDCT, respectively; area under ROC for Mgrad was higher (0.927) than for MDCT (0.863). Conclusions: Mgrad assessment based on MDCT results is more effective than only MDCT for PC diagnosis in patients with CP. Mgrad value positively correlates with PC existence, therefore it could be useful for PC diagnosis.

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Introduction:The purpose was to evaluate the diagnostic accuracy of multidetector 128-row computed tomography (MDCT) in tumor-vessel contact assessment for predicting vascular invasion in patients with hilar cholangiocarcinoma (HCCA). Methods: We analyzed results of MDCT with intravenous contrast enhancement in 29 patients with MDCT-pattern of HCCA who underwent surgical treatment and verified HCCA from January 2015 to July 2019. We assessed tumor-vessel contact in degrees of the circumference and length of contact in combination and separately. Hepatic arteries (HA) and portal vein (PV) involvement assessed separately. There were 49 cases of potential HA involvement and 48 cases of potential PV involvement. Results: We expected vascular involvement, when at least one sign was positive: tumor-vessel contact ≥ 180° and/or length of tumor-vessel contact ≥ 11 mm. Sensitivity (Sn), specificity (Sp), accuracy (Ac), positive (PPV) and negative predictive value (NPV) of combined approach were 90.