目的探究侵袭性垂体瘤术前磁 共振成像(MRI)信号特征及其诊断价值。 方法 回顾性分析2015年2月至2017年12月 我院收治的55例侵袭性垂体瘤患者的临床 资料，所有患者均行MRI扫描，测量肿瘤 的最大直径，记录肿瘤的形态、部位、 信号强度特点，向周围组织浸润程度及方 向。结果 侵袭性垂体瘤MRI表现为T1WI扫 描呈等、稍低信号，T2WI呈等或稍高信 号；55例患者垂体瘤均对周围组织结构有 不同程度的侵犯，表现为海绵窦不同程度 侵犯、束腰征、鞍底塌陷、骨质吸收变 薄等特征；MRI诊断鞍上及鞍内侵犯符合 率为100.00%，诊断海绵窦侵犯符合率为 90.00%。结论 MRI及动态增强扫描可较好 的显示侵袭性垂体瘤大小、位置、生长方 向及其与周围组织的关系，对临床手术术 式选择及预后判断具有指导作用。

Objective To investigate the preoperative magnetic resonance imaging (MRI) signal features of invasive pituitary tumors and their diagnostic value. Methods The clinical data of 55 patients with invasive pituitary tumors who were admitted to the hospital during the period from February 2015 to December 2017 were analyzed retrospectively. All patients underwent MRI scan and the maximum diameter of the tumor was measured. The shape, location, signal intensity, infiltration degree of surrounding tissues and the direction of tumors were recorded. Results MRI findings of invasive pituitary tumors showed slightly lower and equal signals on T1WI scan, and equal or slightly higher signals on T2WI. There were different degrees of invasion of surrounding tissue structure by pituitary tumors in 55 cases, showing different degrees of invasion of cavernous sinus, hourglass signs, collapse of sellar floor and thinning of bone resorption, etc. The coincidence rates of MRI in the diagnosis of invasion above and in the saddle was 100.00%, and in the diagnosis of cavernous sinus invasion was 90.00%. Conclusion MRI and dynamic contrast-enhanced scan can better display the size, location, growth direction of invasive pituitary adenoma and its relationship with surrounding tissues, and can guide the choice of surgical methods and prognosis.