Histopathological Classification (WHO头颈肿瘤分类,2005) ●1.恶性肿瘤 Malignant epithelial tumors ●2.良性肿瘤 Benign epithelial tumors ●3.软组织肿瘤 Soft tissue tumors ●4.淋巴造血系统肿瘤 Heamitolymphoid tumors ●5.继发性肿瘤 Secondary tumors 唾液腺肿瘤Histopathological Classification (WHO头颈肿瘤分类,2005)  1. 恶性肿瘤 Malignant epithelial tumors  2. 良性肿瘤 Benign epithelial tumors  3. 软组织肿瘤 Soft tissue tumors  4. 淋巴造血系统肿瘤 Heamitolymphoid tumors  5. 继发性肿瘤 Secondary tumors 唾液腺肿瘤 4