Pulmonary expansion edema is a rare complication of the management of primary spontaneous pneumothorax. We report a 20 year old male admitted with a right primary spontaneous pneumothorax. A chest tube connected to a water seal was placed, achieving lung expansion. Immediately, the patient presented hypotension and a reduction in arterial oxygen saturation to 78%. Non-invasive ventilation was started. A chest X ray showed extensive right lung edema. The patient was managed with noradrenaline and albumin infusion with good response. Pulmonary edema resolved on day 3 but air leak was persistant so, the patient required surgery to excise apical bullae in the right lung. He was discharged during the following days in good condition.Pulmonary expansion edema is a rare complication of the management of primary spontaneous pneumothorax. We report a 20 year old male admitted with a right primary spontaneous pneumothorax. A chest tube connected to a water seal was placed, achieving lung expansion. Immediately, the patient presented hypotension and a reduction in arterial oxygen saturation to 78%. Non-invasive ventilation was started. A chest X ray showed extensive right lung edema. The patient was managed with noradrenaline and albumin infusion with good response. Pulmonary edema resolved on day 3 but air leak was persistant so, the patient required surgery to excise apical bullae in the right lung. He was discharged during the following days in good condition.