垂体腺瘤通常引起蝶鞍扩大并向鞍上发展,而向鞍旁发展的较少,约占垂体腺瘤的6％～10％。作者对25例经手术证实的向鞍旁侵犯的垂体腺瘤,根据其术前MRI扫描进行了分级,共分为五级。主要是以海绵窦和其内及上方的颈内动脉作为标志。简述如下:0级,肿瘤外界没有超过海绵窦内和其上方的颈内动脉之间内侧连线,海绵窦形态正常;Ⅰ级,肿瘤向周边生长,抵达颈内动脉中心连 Pituitary adenomas usually cause the sella to dilate and develop toward the saddle, but less to the parasellar, accounting for about 6% to 10% of pituitary adenomas. The authors classified 25 pituitary adenomas that had been confirmed by surgery to beside the parasellar and were graded according to preoperative MRI scans and were divided into five grades. The cavernous sinus and the internal carotid artery in and above it are used as markers. The brief description is as follows: Level 0: The outside of the tumor does not exceed the internal connection between the cavernous sinus and the internal carotid artery above it. The shape of the cavernous sinus is normal. In the grade I, the tumor grows to the periphery and reaches the center of the internal carotid artery.