An incidental adrenal mass can be identified as a myelolipoma based on features seen on imaging studies.


Components of a myelolipoma:

(1) erythyroid and myeloid elements ("myelo")

(2) adipose tissue ("lipoma")


Findings seen on imaging studies:

(1) low attenuation (density) on unenhanced CT scan (<= 10 Hounsfield units)

(2) hyperintense on T1-weighted in-phase MRI

(3) evidence of pure fat on CT scan or ultrasound (highly reflective)


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