Diagnosis of peritoneal dissemination: comparison of XXXX PET/CT, diffusion-weighted MRI, and contrast-enhanced MDCT.

@entity5 @entity1 @entity419
OBJECTIVE: The purpose of this study was to compare the diagnostic performance of @entity419 PET/CT, MRI with and without diffusion-weighted imaging (DWI), and contrast-enhanced MDCT in the detection of peritoneal dissemination of @entity5 . MATERIALS AND METHODS: We retrospectively evaluated the cases of 107 @entity1 who underwent PET/CT and 130 @entity1 who underwent MRI and contrast-enhanced MDCT. Twenty-six @entity1 who underwent PET/CT and 23 who underwent MRI and contrast-enhanced MDCT were found to have peritoneal dissemination. All images were independently evaluated by two radiologists using a 5-point grading system. The results of PET/CT, T1- and T2-weighted MRI without DWI, MRI with DWI (b = 1,000 s/mm(2)), and contrast-enhanced MDCT were compared @entity1 by @entity1 and lesion by lesion by use of receiver operating characteristics analysis. Sensitivity, specificity, and positive predictive value were calculated and compared by use of the chi-square test. RESULTS: @entity1 by @entity1 , the area under the receiver operating characteristics curve of MRI without DWI (0.88) was significantly less than that of the other modalities (contrast-enhanced MDCT, 0.91; MRI with DWI, 0.93; PET/CT, 0.97). The sensitivity of PET/CT (94%) was significantly higher than that of MRI without DWI (70%). The specificities of the modalities were not significantly different. In lesion-by-lesion analysis, MRI without DWI had significantly lower sensitivity (56%) than the other modalities (contrast-enhanced MDCT, 76%; MRI with DWI, 84%; PET/CT, 89%). The positive predictive value of PET/CT (93%) was significantly higher than that of the other three modalities (contrast-enhanced MDCT, 73%; MRI without DWI, 70%; MRI with DWI, 72%). CONCLUSION: PET/CT is the most useful technique for pathologic staging in the care of @entity1 with @entity5 . If PET/CT is not available, DWI can be used as a screening tool.
