案例：患者，男，40岁。教师职业，低热伴乏力、食欲缺乏及消瘦月余。因血友病有多次血制品输注史。体查见唇周苍白，口腔黏膜布满白色膜状物，四肢大关节畸形。实验室检查：血象：白细胞2.3×109/L，Hb78g/L。患者口腔所见提示

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