Is hyperaldosteronism a pathognomonic feature of conn's syndrome?

A 10-year-old female child presented with resistant hypertension and hypokalaemia. There was no muscle weakness or periodic paralysis. The ratio of plasma aldosterone concentration to plasma renin activity was increased. MRI of the abdomen showed the right adrenal mass. The child underwent open right adrenalectomy. she had natriuresis in the postoperative period. She was normotensive without antihypertensive drugs at discharge and 2 months after surgery.