[ Methods] Choose95 cases of blood pleural effusion which can not be diagnosed by normal methods to do the thoracoscopy under local anesthesia, and to observe the reaction of the patients during the operation.

• 方法对95例不明原因的血性胸腔积液患者实施局麻下开放式胸腔镜术,直视下取病变组织行病理检查。