7. Retroperitoneum

CASE #1:  

  FINDINGS: 
              T1: Hypointense intravascular lesion 
              T2: Hyperintense intravascular lesion
              post-GADO: Enhancing lesion with necrotic center

CASE #2:  

  FINDINGS: 
              T1: Hypointense aorta due to flow void. The peripheral inner hypointensity represents liquefaction whereas the outer
              hypointensity represents fibrosis.
              T2: Hypointense aspect of retroperitoneal fibrosis
              post-GADO: Strong homogenous enhancement
              Other: Note the hydronephrosis of the left renal cavities due to fibrosis