六、恶性血管内皮瘤恶性血管内皮瘤（malignantmesothelioma）又称血管肉瘤，小儿少见。
O O B-dis I-dis I-dis I-dis I-dis I-dis I-dis B-dis I-dis I-dis I-dis I-dis I-dis I-dis O B-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis O O O B-dis I-dis I-dis I-dis O O O O O O