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Abstract #2981

Diffusion-Weighted Imaging of Retroperitoneal Fibrosis & Retroperitoneal Lymphoma: Can Apparent Diffusion Coefficient Values Distinguish the Two?

Bradley Spieler1, Caludia Reuben Seuss1, Daniel Sahlein1, Sooah Kim1

1Radiology, New York University, New York, NY, United States

27 patients with histopathologically proven retroperitoneal lymphoma (n=16) and retroperitoneal fibrosis (RPF, n=11) who underwent MRI including DWI using b-values of 0, 400, and 800 sec/mm2 at 1.5T were included. Two readers measured ADCs independently. ADC values of lymphoma and RPF were compared by independent sample t-test. There was no statistical difference in measured ADC between lymphoma (1.26 *10-3mm2/sec, range 0.54-2.03 *10-3mm2/sec) and RPF (1.35 *10-3mm2/sec, range 0.61-2.45 *10-3mm2/sec) (p=0.57).