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Abstract #0808

Diffusion and Post Contrast MFAST imaging for Evaluation of Acute Appendicitis: The Stanford Experience

Alex Lewis 1 , Mathew Bernbeck 1 , Richard Barth 1 , and Shreyas Vasanawala 2

1 Radiology, Stanford University, Stanford, CA, United States, 2 Stanford University, Stanford, CA, United States

All pediatric appendicitis MRIs from 1/2014 to 9/2014 with diffusion and post contrast sequences at our institution were retrospectively identified and randomized into two groups (36 each). All studies were scored by three readers of varying experience with appendicitis MRI for delineation of the appendix, confidence of assessment of acute appendicitis and perforation/abscess after each series. Appendicitis was present in 18/72 (25%) cases and complication in 6/72 (8%). An appendix or appendiceal candidate was identified in 36, 18 and 56% of cases for readers 1, 2 and 3 respectively with SS, increasing to 89, 36 and 100% for SS+CE, and 53, 19 and 100% for SS+DW. Sensitivity and specificity of detection of appendicitis and perforation/abscess were also evaluated. Results demonstrate that both DWI and contrast enhanced imaging increase performance of MRI for diagnosis of appendicitis.

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