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

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).