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患者男性，２１岁。因反复便血９年，来我院就诊，既往史否认有肝炎、肝硬化病史，亦无血吸虫疫水接触史。家族中其父有反复便血病史数十年，从未作任何检查。体检：贫血貌，无蜘蛛痣及肝掌，胸腹壁无静脉曲张，腹水征（－），实验室检查：血红蛋白７５ｇ／Ｌ，白细胞４．６×
Patient male, 21 years old. Due to repeated 9 years of blood in the stool, to our hospital, past history denied having hepatitis, cirrhosis history, nor schistosome water contact history. The family has a history of repeated bloodless stools for decades and has never given any examination. Physical examination: anemia appearance, no spider nevus and liver palms, no varices in the thoracic and abdominal wall, signs of ascites (-), laboratory tests: hemoglobin 75g / L, white blood cells 4.6 ×