We have recently experienced a neurogenic tumor of the paravertebra in a 35-year-old man. The patient suffered from dull pain in the right side of the abdomen during previous three years. An abnormal mass shadow of the right lung had been detected on chest X-ray examinations at a medical checkup. CT findings indicated a tumor invasion between the thoracic vertebra 10^th and 11^th. Operation was performed with a Tshaped skin incision of the back and a resection of the posterior part of the 10^th and 11^th rib. The tumor was resected safely after partial resection of the ramina of 10^th thoracic vertebra. The tumor was neurinoma of the 10^th intercostal nerves. Paravertebral tumors sometimes grow in the intervertebral and take the form of the Dumbbell. An operation should be performed early in the course of treatment, because the growing tumor may appress the spinal cord to cause clinical symptoms.