An adrenocortical adenoma can be suspected as the cause of an adrenal mass based on its imaging features.



(1) typically <= 3.0 cm in diameter (people get nervous when the diameter is > 4 cm)

(2) stable to slowly enlarging (< 1.0 cm per year)

(3) usually solitary and unilateral


Shape: round to oval with smooth margins


Imaging features of an adrenal adenoma:

(1) homogeneous texture without cystic areas

(2) attenuation (density) on unenhanced CT is <= 10 Hounsfield units

(3) not highly vascular

(4) washout of contrast material is >= 50% at 10 minutes

(5) T2-weighted MRI images are isointense in relation to the liver

(6) necrosis and hemorrhage are rare

(7) calcifications are rare


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