17.下列有關胸腺瘤(thymoma)之Masaoka staging之敘述,何者錯誤? (A)Stage IVa:胸腔外轉移 (B)Stage I:腫瘤之capsule完整,無capsule invasion (C)Stage II為capsule invasion (D)Masaoka Stage III為macroscopic invasion至周圍的器官,如心包膜、大血管或肺