Adrenal adenoma with Conn syndrome

Case contributed by Ammar Haouimi
Diagnosis almost certain


Hyokalaemia with metabolic alkalosis, and low renin levels in hypertensive patient.

Patient Data

Age: 55 years
Gender: Female

There is a well-circumscribed ovoid hypodense left adrenal mass with no calcification. The attenuation value on these non-contrast images was -5 HU.

Simple hepatic cyst of the segment VIII is noted as well as a small left renal cyst.

Case Discussion

The clinical as well as the CT features indicate Conn syndrome or primary hyperaldosteronism secondary to adrenal cortical adenoma.

Primary hyperaldosteronism can be due to adrenal cortical adenoma, bilataeral adrenal hyperplasia, or rarely adrenal carcinoma

On non-contrast CT scan an attenuation value of the lesion < 0 HU as in this case is considered 47% sensitive and 100% specific for a lipid rich adrenal adenoma.


Additional contributor: Z Boudiaf MD CHU Constantine, Algeria 

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