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Primary aldosteronism caused by unilateral adrenal hyperplasia.

In the hypertensive population, primary aldosteronism has been reported to have a prevalence of 0.1% to 2%, with the main causes being aldosterone-producing adenomas and bilateral hyperplasia. However, there is a third rare entity, called unilateral adrenal hyperplasia, that contributes to primary aldosteronism. Unilateral hyperplasia and primary aldosteronism are the subjects of this case review.