Pheochromocytoma is a rarely seen neuroendocrine tumor that causes hypertension, tachycardia, sweating, palpitations, headache and anxiety. Excessive cathecolamin release can occur during surgical manipulation and induction of general anesthesia. Particularly this release can increase during resection of tumor (1). In these clients, a meticulous preoperative preperation and perioperative close monitorisation is important (2). It is possible to come up with these patients which are not diagnosed before, during surgeries other than surrenal surgery. Intraoperative malignant hypertension should bring pheochromacytoma in minds and postoperative tests should be done for diagnosis. In this report we aimed to share a case which had malignant hypertansive crisis during ortophedic surgery and diagnosed as a pheochromocytoma postoperatively.