患者,男,48岁,因头痛伴恶心呕吐50天,以颅凹占位性病变收入院,作颅内手术。术中见右侧小脑扁桃体近蚓部及延脑处有2×2×1cm大小的肿物,手术切除。病理巨检为灰白色碎组织,总体积1.5×1.5×1cm,质软,较脆。显微镜检:肿瘤呈乳头状结构,乳头密集,但不规则,上皮细胞增生显著,生长活跃,排 Patient, male, 48 years old, suffered from headache with nausea and vomiting for 50 days and admitted to the hospital with cranial recession lesions for intracranial surgery. Surgery see the right cerebellar tonsil vermis and the Department of Yannao 2 × 2 × 1cm size of the tumor, surgical resection. The pathological macroscopic examination was gray and white broken tissue, the total volume of 1.5 × 1.5 × 1cm, soft, more brittle. Microscopy: The tumor was papillary structures, dense nipple, but irregular, epithelial cell proliferation was significant, active growth, row