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讨论三脑室及鞍上区异常之前,宜光学习一下该部位之正常解剖。颅咽管瘤是可见于任何年龄的鞍上肿瘤,但罕见于2岁之前。肿瘤以囊性及相当范围的钙化为特征,儿童中约80%,成人约40%有钙化。CT 上颅咽管瘤偶可表现为均一的高密度,这通常指示系一实体性肿瘤,但可能勉强证实是一伴高密度成份的囊。当CT 上一颅咽管瘤呈一致性增强时,可能难与一嫌色细胞腺瘤或大动脉瘤区分。无钙化低密度
Before discussing the anomalies of the third ventricle and the suprasellar region, it is advisable to study the normal anatomy of the site. Craniopharyngiomas are suprasellar tumors of any age, but rare before 2 years of age. Tumors are cystic and a substantial range of calcifications, about 80% of children and about 40% of adults have calcifications. Craniopharyngiomas on CT may even exhibit a uniform high density, which usually indicates a solid tumor, but may barely prove to be a capsule with high-density components. When a consistent increase in craniopharyngioma on CT, it may be difficult to distinguish with a chromophobe adenoma or aneurysm. No calcification Low density