A 21 year-old female underwent resection of a pheochrocytoma under general anesthesia. The patient was treated with phenoxybenzamine for 5 days preoperatively and premedicated with triflupromazien, Librium, Seconal, pethidine, hydroxyzine and atropine in combination. Following indution of anesthesia with intravenous morphine and thiopental sodium, succinylchoine was administered intravenously and endotracheal intubation was performed. Anesthesia was maintained with nitrous oxide, oxygen and methoxyflurane, using a semiclosed carbon dioxide absorption circle system, and alcuronium was injection intermittently. Blood pressure during manipulation of tumor was increased up to 190/130 torr without arrhythmia and transiently dropped to 70/50 torr immediately after removal. Blood pressure was controlled by i.v. Hartmann's solution and whole blood with Solucortef and Effortil but not norepinephrine was needed. There was no marked tachycardis or arrhythmia during anesthesia, so a beta-adrenergic blocker(Inderal) was not used. The importance of preoperative preparation, premedication and selction of anesthetics is discussed.