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原发于松果体的肿瘤虽不多见,但其名称与分类很混乱。Krabbe(1916)首次称松果体实质细胞的肿瘤为松果体瘤。在胚胎早期,松果体由未分化的小圆细胞与大型成熟细胞组成镶嵌状结构的团块,很多人便以颅内大小两型细胞具有所谓镶嵌结构作为诊断松果体瘤的依据。松果体以外的此类颅内肿瘤称为异位松果体瘤。后经深入研究,发现松果体细胞瘤并不具有这种特征。Russell(1944)认为颅内这种两型细胞的肿瘤是非典型畸胎瘤;Friedman
Although rare in the pineal tumor, but its name and classification is very confusing. Krabbe (1916) first described pineal somatic tumor as pineal tumor. Early in the embryo, pineal gland consists of undifferentiated small round cells and large mature cells mosaic mosaic structure of the mass, many people with intracranial size of two types of cells have so-called inlaid mosaic structure as the basis for the diagnosis of pineal tumors. Such intracranial tumors outside the pineal gland are called ectopic pineal tumors. After an in-depth study, found that pineal somatic cell tumors do not have this feature. Russell (1944) considered this type of intracranial tumor of two types of cells to be an atypical teratoma; Friedman