Invasion by malignant cells can cause either regional lymphadenopathy, as in patients with head and neck tumors, or generalized lymphadenopathy, as in patients with disseminated carcinomatosis.
恶性细胞侵犯可导致局部淋巴结病如在头颈部肿瘤的病人中，也可是全身性淋巴结病如在播散性癌转移的病人中。
Objective:To investigate the clinical diagnosis, mechanism and treatment for second malignant tumors (SMTs) of head and neck induced by radiotherapy.
目的：探讨头颈部肿瘤放射治疗后诱发第二恶性肿瘤的诊断、机理及治疗方法。
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