INTERFERENCE BY SPIRONOLACTONE ON ADRENOCORTICAL SCINTIGRAPHY AND OTHER PITFALLS IN THE LOCATION OF ADRENAL ABNORMALITIES IN PRIMARY ALDOSTERONISM

A case of primary aldosteronism is presented in which the CT scan was initially misleading, adrenocortical scintigraphy was rendered inaccur ate by pharmacological interference of spironolactone, and selective a drenal venous sampling of aldosterone was technically difficult. When dexamethasone suppression adrenocortical scintigraphy was performed wi th attention to technical detail and exclusion of interference by spir onolactone, the causative lesion was scintigraphically demonstrated. T his finding was confirmed by the results of venous sampling and the co rrectly located tumor removed.