Pseudohypoaldosteronism in a female infant and her family: diversity of clinical expression and mode of inheritance.

Pseudohypoaldosteronism was diagnosed in an infant that clinically presented severe failure to thrive and vomiting. Evaluation of her extended family revealed many other affected family members with a vast range of clinical expression. The mode of inheritance is most likely autosomal dominant. Salt supplementation during infancy was effective in restoring normal growth, weight gain and serum electrolytes.