Localized fibrous tumor of the pleura is very rare. Most of them are benign, some of them but some are malignant. Although some tumors are histologically malignant, (This clause does not relate with the rest of the sentence.) the The single best predictor of clinical benignity is whether the tumor can be totally resected. We experienced a case of localized fibrous tumor of the pleura in a 57 year old man with right chest pain and cough. He heard that he had He was informed of a 8X5cm mass in his right lower lung field, but the mass which was benign 3 years ago. Preoperative chest x-ray showed an increased hazy density at right lower lung field (,) and CT scan showed a 12X8cm huge mass (,) which was located in right lower thorax. Left thoracotomy was done and to excise a 12X8X5cm(1200gm) sized large mass was excised (delete). The patient was discharged without any complications postoperatively.