[Primary amenorrhoea, hypertension, and hypokalaemia in 17-hydroxylase deficiency, a not uncommon condition (author's transl)].

Five phenotypic female patients with primary amenorrhoea, mild hypertension, and hypokalaemia are described. The condition originates from 17-hydroxylase deficiency in both adrenals and gonads. Two cases had a XY chromosome pattern, two cases were familial. It is suggested to determine serum potassium in all cases with unexplained primary amenorrhoea.