[A solitary kidney patient with diarrhea of 2 weeks duration].

The case is presented of a 78 year old woman with a history of congenital right renal, who suffered from diarrhea of approximately 2 weeks duration and discomfort due to cramp in both legs. The laboratory results showed severe hyperkalemia, hyponatremia, and slightly elevated creatinine levels, with no symptoms associated with this finding and with the rest of the normal laboratory results. She was admitted to the intensive care unit for treatment, and when her results returned to normal she was transferred to internal medicine. Among the other tests performed, the ACTH was shown to be high, and a left adrenal adenoma was found in the MR scan. The final diagnosis was Addison's syndrome. She was treated with mineralocorticoids with follow-up by internal medicine as an outpatient.