Kjos B O, Brant-Zawadzki M, Kucharczyk W, Kelly W M, Norman D, Newton T H
Radiology. 1985 May;155(2):363-9. doi: 10.1148/radiology.155.2.3983386.
Thirty-three patients with cystic intracranial lesions were examined with both magnetic resonance (MR) imaging and CT scanning. The abnormalities imaged included 11 arachnoid cysts, 10 cystic tumors, six postoperative cysts, and three colloid cysts. The intensity patterns of the cyst contents as encoded with routine spin-echo imaging sequences enabled subdivision of the cysts into three categories. Arachnoid and postoperative cysts had an intensity pattern identical to cerebrospinal fluid. More proteinaceous cysts, including inflammatory cysts and nonhemorrhagic tumoral cysts, had an intermediate intensity pattern with characteristically low intensity on the short TR sequence (0.5 sec), but had clearly higher intensity than cerebrospinal fluid on the long TR sequences (2 sec). Finally, three cystic tumors with hemorrhagic fluid and three colloid cysts had a distinctly different pattern of high intensity on all four MR sequences through the same section. MR was superior to CT in characterizing intracranial cystic lesions because of its ability to categorize cysts into these three groups on the basis of the intensity pattern of cyst contents, thereby improving diagnostic specificity and patient management.
对33例颅内囊性病变患者进行了磁共振（MR）成像和CT扫描检查。成像显示的异常包括11个蛛网膜囊肿、10个囊性肿瘤、6个术后囊肿和3个胶样囊肿。通过常规自旋回波成像序列编码的囊肿内容物的信号强度模式可将囊肿分为三类。蛛网膜囊肿和术后囊肿的信号强度模式与脑脊液相同。蛋白质含量更高的囊肿，包括炎性囊肿和非出血性肿瘤性囊肿，具有中等信号强度模式，在短TR序列（0.5秒）上特征性地表现为低信号强度，但在长TR序列（2秒）上明显高于脑脊液。最后，三个有出血性液体的囊性肿瘤和三个胶样囊肿在同一层面的所有四个MR序列上均呈现明显不同的高信号模式。MR在颅内囊性病变的特征性诊断方面优于CT，因为它能够根据囊肿内容物的信号强度模式将囊肿分为这三组，从而提高诊断特异性和患者管理水平。
