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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Purpose: To evaluate an adrenal mass for imaging features associated with an adrenocortical adenoma.
Specialty: Endocrinology, Clinical Laboratory, Hematology Oncology
Objective: imaging studies, criteria for diagnosis