1-etiology:excess production of cortison by adrenal cortex,due to excess production of ACTH,resulting from adrenal adenoma or hyperplasia.
2-CT adrenal is done in case of cushing disease to distinguish ACTH dependent(hyperplasia) from independent type(focal mass disorders) and to determined the site of this focal mass disorders.
3-CT findings of adenoma
-size:more than 2cm,from 2 to 5 cm in diameter.
-smooth,round or oval and homogenous with little enhancement.
-mostly are of soft tissue attenuation,but it could be near water attenuation(relative high fat content).
4-it should be noted that the CT appearance of different types of adenomas are indistinguishable whether they produce excess cortisol or aldesterone or they are not hyperfunctioning.
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