松果体肿瘤比较少见。国外资料统计其发生率在整个颅内肿瘤中少于1%。目前对其病理形态学分类尚无一致看法;尤其是超微结构的研究更为稀少。迄今国内尚未见有关报道。现将国外近几年研究动态综述如下: 一、松果体肿瘤形态学分类的新观点: 传统的分类法把松果体肿瘤分为两大类:(一)松果体生殖细胞瘤:在此之前曾认为本瘤由松果体细胞发生,一度命名为松果体瘤(Pinealoma),后查明瘤细胞起 Pineal tumors are rare. The incidence of statistics in foreign countries is less than 1% of the total intracranial tumors. At present, there is no consensus on its pathomorphological classification; especially the ultrastructural studies are even rarer. So far no relevant reports have been found in China. The current research dynamics in recent years are summarized as follows: 1. New perspectives on morphological classification of pineal tumors: The traditional classification divides pineal tumors into two major categories: (i) Pineal gland germ cell tumors: Previously, this tumor was thought to have originated from pineal cells. It was once designated as Pinealoma. After the detection of tumor cells,