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[Localized fibrous mesothelioma with bloody pleural effusion; report of a case].

Diffuse malignant mesothelioma with bloody pleural effusion is not rare, but a localized fibrous mesothelioma with bloody pleural effusion is relatively rare. A 45-year-old woman presented with a localized fibrous mesothelioma causing a bloody pleural effusion. Her chief complaint was right-sided lateral chest pain. A chest roentgenogram demonstrated a right-sided pleural effusion, so a chest tube was inserted, and the bloody fluid drained. A preoperative diagnosis of localized fibrous mesothelioma was made based on chest computed tomography and examination of computed tomographic guided percutaneous needle biopsy specimen. At operation, the tumor seemed to have originated from the right lung parenchyma or had invade the right lower lobe because tumor had penetrated deeply in the lung. Tumor and part of the parietal pleura were resected by right lower lobectomy. Final pathology established that the tumor was adherent to the right lung and was only encapsulated by the lung.