Wu W, Thuomas K A
China-Japan Friendship Hospital, Beijing, P.R. China.
Acta Radiol. 1995 Sep;36(5):529-35.
Twenty surgically proven pituitary microadenomas were examined with MR imaging and CT. MR demonstrated 20 of 20 microadenomas: 90% of the tumors were hypointense on T1-weighted images before Gd-DTPA administration and in 45% the tumors were more clearly delineated postcontrast. CT demonstrated 19 of 20 diagnosed microadenomas: showing low attenuation in 85% of the tumors precontrast. Iohexol facilitated delineation of the tumors in 45%. Focal enlargement of the gland and diaphragma sellae convexity were more useful than infundibular tilting and sellar-floor erosion as ancillary findings supporting the diagnosis. In general, CT and MR agreed regarding the microadenomas size and location, measurement of enlarged intrasellar contents, detection of the diaphragma sellae bulge, and demonstration of infundibulum abnormality. CT was more sensitive than MR in identifying sellar-floor erosion. We suggest that CT be the first method for demonstration of microadenomas.
对20例经手术证实的垂体微腺瘤进行了磁共振成像（MR）和计算机断层扫描（CT）检查。MR显示了20例中的20例微腺瘤：90%的肿瘤在注射钆喷酸葡胺（Gd-DTPA）前的T1加权图像上呈低信号，45%的肿瘤在增强后更清晰可辨。CT显示了20例已诊断微腺瘤中的19例：85%的肿瘤在平扫时呈低密度。碘海醇使45%的肿瘤轮廓更清晰。腺体局灶性增大和鞍膈凸起作为支持诊断的辅助表现，比漏斗倾斜和鞍底侵蚀更有用。总体而言，CT和MR在微腺瘤大小和位置、鞍内扩大内容物的测量、鞍膈凸起的检测以及漏斗异常的显示方面意见一致。CT在识别鞍底侵蚀方面比MR更敏感。我们建议CT作为显示微腺瘤的首选方法。
