恶性变是相当罕见的。
目的探讨泪腺良性多形性腺瘤术后易复发和恶性变的原因。
Objective To investigate the causes of recurrence and malignant change of pleomorphic adenoma (benign mixed tumour) of lacrimal gland.
其它的外科医生认为必须切除以治疗脑积水，预防可能的恶性变。
Others believe that the tumor should be resected to cure the hydrocephalus and prevent possible degeneration into a higher grade tumor.
家族性病变占7% ，双侧病变13% ，恶性变10 % ，内分泌倾向者3%。
Family occurrence (7%), bilateral growth (13%), trend of endocrine-secretion (2.6%), and malignant changes (10%) were found.
良性的软脑膜黑色素沉着发生在黑色素细胞巢或细胞床增殖区域，不伴有明显的恶性变。
Benign leptomeningeal melanosis occurs when there are areas of proliferation of sheets or nests of melanocytes without frank malignant change.
在40- 50%的神经皮肤黑变病的患者中软脑膜黑色素沉着是恶性的。
Leptomeningeal melanosis is malignant in 40-50% of patients with neurocutaneous melanosis.
良性肿瘤的囊性变与恶性肿瘤的液化坏死在声像图上无特异性表现。
There was no distinguished features between cystic degeneration of benign tumors and the liquefactive necrosis of malignancy.
本文对27例恶性淋巴上皮病损进行了临床病理学分析和随访调查，探讨肿瘤生物学行为有关的病理因素，发现间质中纤维结缔组织多．玻璃样变明显者预后较差。
The results of comparative analysis between pathological indexes and biological behavior suggested that the cases with rich fibrous stroma and excessive hyalinazation of stroma had worse prognosis.
本文对27例恶性淋巴上皮病损进行了临床病理学分析和随访调查，探讨肿瘤生物学行为有关的病理因素，发现间质中纤维结缔组织多．玻璃样变明显者预后较差。
The results of comparative analysis between pathological indexes and biological behavior suggested that the cases with rich fibrous stroma and excessive hyalinazation of stroma had worse prognosis.
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