The patient underwent uneventful left orchiectomy and right orchiopexy with an anesthesia time of 1.5 h. Anesthetic and analgesic agents used included succinylcholine, midazolam, fentanyl, propofol, sevofluorane, ketorolac, and morphine. Intubation, extubation, and recovery room transfer all occurred without apparent complications. One hour later, the patient developed dyspnea, cough, and blood-streaked sputum. He required 3 L/min of oxygen by nasal cannula to maintain oxygen saturation above 90%. His vital signs were otherwise normal. On respiratory exam, there were new bilateral inspiratory crackles.