Abstract
Renal tubular dysfunction may be recognized in patients suffering from urinary light chain disease or non-myelomatous hypergammaglobulinaemia. We report a patient who has the combination of distal renal tubular acidosis and nephrogenic diabetes insipidus in association with hypergammaglobulinaemia due solely to increased IgG. We postulate that the abnormalities of distal nephron function resulted from cell-mediated immune damage.