Nephrocalcinosis and hypokalemia in a patient with primary Sjögren's syndrome.

Clinically significant renal involvement is uncommon in primary Sjögren's syndrome, amid which tubulointerstitial disorders, distal renal tubular acidosis (dRTA) particularly, account for the majority. Conversely, Sjögren's syndrome comprises at least half the patients presenting with renal tubular acidosis. While underlying dRTA itself is an important cause of nephrocalcinosis and urolithiasis, nephrocalcinosis is rarely a presenting feature of primary Sjögren's syndrome. I report a 41-year-old female contracting nephrocalcinosis and hypokalemia as complications of primary Sjögren's syndrome with dRTA, hereby to emphasize the importance of alkali therapy.