Adrenal myelolipoma - MRI

Discussion:

CT appearance of adrenal myelolipoma is usually characteristic of fat-containing lesion, however, MRI features may be somewhat confusing.

MRI features of adrenal myelolipoma include:

  • T1: typically hyperintense due to fat contents
  • T1 (FS): shows fat suppression
  • T2: generally intermediate to hyperintense but can sometimes vary depending on contents (especially blood products) 
  • T1 C+ (Gd): shows striking enhancement 1
  • in and out of phase: in masses with mixed components, out of phase imaging may demonstrate signal loss as the microscopic fat cells usually have little intracellular water
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