An adverse pregnancy-associated outcome due to overlooked primary aldosteronism.

A 31-year-old woman with treatment-resistant pregnancy-induced hypertension during her first pregnancy delivered a small-for-gestational-age infant (weight: 1,070 g). After delivery, she was diagnosed with primary aldosteronism (PA) associated with a left adrenal adenoma. Following a thorough examination, she underwent laparoscopic left adrenalectomy, and the diagnosis of an aldosterone-producing adenoma was confirmed based on a pathological examination. Thereafter, the patient's hypertension and hypokalemia completely disappeared. She became pregnant again and successfully delivered her second infant at the 37th week of gestation (weight: 2,720 g) without developing treatment-resistant hypertension. Secondary causes of hypertension should not be overlooked, even in young pregnant women.