Reversible pulmonary hypertension post adenotonsillectomy.

An 18-month-old boy presented with signs and symptoms of obstructive sleep apnea and pulmonary hypertension of 12 months duration. Confirmatory laboratory studies, in the form of echocardiography and overnight oximetry, were carried out, which showed hypoxemia and severe pulmonary hypertension. He had adenotonsillectomy, which resulted in complete resolution of signs and symptoms of pulmonary hypertension. Chronic upper airway obstruction should not be overlooked as it is a reversible cause of pulmonary hypertension.