摘要
目的:探讨鞍区病变相关的形态变化规律。方法:运用高场强的MR扫描机,连续观测14例垂体微腺瘤、12例大腺瘤、1例生殖细胞瘤和11例空蝶鞍,研究鞍区相关结构的形态改变。结果:垂体腺瘤大致呈膨胀性生长,推压周围结构;而生殖细胞瘤呈浸润性生长,周围结构很早即可出现信号改变。空蝶鞍可以发生在鞍膈上,也可以出现在鞍膈下。结论:垂体柄的形态变异大,既可以偏斜,也可以折曲。垂体微腺瘤的诊断不能依赖于垂体柄的偏斜及垂体腺的局部高起与否。多数大腺瘤周围可以识别垂体腺组织,一般呈薄片状位于肿瘤的上面、后面和两侧。作者根据空蝶鞍是否存在膈下蛛网膜下池而分为Ⅰ型、Ⅱ型.再按空虚是否完全而分出Ⅰa、Ⅱa型和Ⅰb、Ⅱb型。由于中国人鞍结节较平坦,真正的"前置型"视交叉较少见,能否安全通过视交叉-颈内动脉间隙手术操作可以参考冠状位MR片。
Objective: To explore the role of morphological changes on MRI of sellar lesions. Method:Using a magnetic resonance imaging (MRI) scanner with pituitary microadenomas, 12 macroadenomas, 1 germinoma and 11 empty sella turcica. Morphological changes of the associated structures of sellar region were studied. Results: Pituitary adenomas developed swollenly, oppressing peripheral changes were early seen. Empty sella turcica appeared above or below sellar diaphram. Conclusion: Shape of pituitary stalk is various, not only defletive but devious. Diagnosis of pituitary microadenomas should not depend on deflexion of pituitary stalk and local hump of pituitary tumors. Normal pituitary tissue, which is lamellarly situated on top, back or both sides of pituitary adenoma, is often able to be distinguished. According to existence or not of subarchnoid cistern below sellar diaphragm, empty sella turcica can be classified into Type Ⅰ and Ⅱ. According to whether emptiness is entire or not, it is classified into Ⅰa, Ⅱa, Ⅰb and Ⅱb. Because sellar tuberculum of Chinese people was rather smooth, prefixed optic chiasm should be rare. MRI findings are available to decide whether operations can be safely performed via the space between optic chiasm and internal carotid artery.
出处
《福州总医院学报》
2004年第3期183-186,共4页
Journal of Fuzhou General Hospital
关键词
鞍区病变
MR检查
磁共振成像
诊断
解剖学
Sellar region Pituitary tumor Empty sella turcica Magnetic resonance imaging Anatomy
