OBJECTIVE To investigate the carotid artery invasion in patients with head and neck malignant tumor with multislice helical CT and MPR. METHODS Thirty-six tumors adjacent to the carotid artery in head and neck were studied using 16 slice helical CT scanner.The following two parameters were measured:tumor-artery angle(the angle surrounded by the tumor)and tumor-artery ratio(the ratio between the length of intersection of the tumor with carotid and the diameter of the carotid).RESULTS Tumor-artery angle:in judgment of carotid involvement with axial CT,the accuracy of the tumor-artery angle≥90?group and the tumor-artery angle≥180?group were higher than that of the tumor-artery angle≥45?group (P

Objective:To investigate the association between the polymorphisms of the hypothalamus pituitary adrenal axis related genes SKA2, AVPR1B, CRHR2 and suicide attempts in patients with depression, and the interaction between the genes and environmental factors.Methods:From March 2017 to August 2018, sixty-one patients with depression who were hospitalized for suicide were selected (case group), and 57 subjects matched with the age, gender and education level of the case group (control group) were selected in the same period.Snapshot genotyping technique was used to test the genotypes of case group and control group.Barratt impulsivity scale (BIS-Ⅱ) and life event scale (LES) were used to assess the impulsive traits and mental stress of individuals in the past year.Chi-square test and independent sample t-test were used for inter group comparison by SPSS 22.0 software.Gene-environment interaction was analyzed by the generalized multi factor dimensionality reduction. Results:The total scores of BIS-Ⅱ and LES in case group(65.05± 11.14, 34.16±27.23) were higher than those in the control group (53.30 ± 9.07, 11.67±12.64), the differences were statistically significant (both P<0.05). There was no significant difference in gene frequency and allele frequency of SKA2 and CRHR2 between the two groups ( P>0.05). The genotype frequency and allele frequency of rs28373064 of AVPR1B gene were significantly different between the two groups (χ 2=5.763, 4.279, both P<0.05), but there was no significant difference after Bonferroni correction ( P>0.05). The best interaction model in GMDR was the third-order model constructed by rs28373064 of AVPR1B gene, impulsive traits and life events, with the highest accuracy of 0.789 for sample test( P=0.001). In multiple genetic models, rs28373064 of AVPR1B gene was associated with attempted suicide behavior in patients with depression(dominant model: A/G-G/G ( OR=0.38, 95% CI=0.16-0.88, P=0.021), overdominant model: A/G ( OR=0.36, 95% CI=0.15-0.87, P=0.019), log-additive model: A/A, A/G and G/G ( OR=0.44, 95% CI=0.20-0.96, P=0.034)). Conclusion:rs28373064 polymorphism of AVPR1B gene is associated with attempted suicide behavior in patients with depression.AA genotype carriers of AVPR1B gene are more likely to commit suicide under the influence of life events and impulsive.