In the acute phase, subdural hematomas appear as hyperdense, crescent shaped extra-axial collections.
在急性期，硬膜下血肿表现为脑外新月状高密度影。
There are many differences between the intraaxial and extra-axial cavernous hemangiomas in their clinical presentation, operative difficulty and prognosis.
二者在临床表现、手术难度和术后效果差异有显著性。
Objective: to study the imaging features of extra-axial tumors and tumor-like lesions involving both middle and posterior cranial fossae and to make a classification.
目的提高对跨中、后颅窝轴外肿瘤及肿瘤样病变的影像学认识。
Forms of traumatic brain injury include skull fractures, extra-axial hemorrhage (epidural, subdural, and subarachnoid), cerebral contusions, and diffuse axonal injury.
脑外伤的形式包括：颅骨骨折、脑外出血(硬膜外、硬膜下、蛛网膜下腔)、脑挫伤、弥漫性轴索损伤。
The maximum rrCBV in tumor and peri-tumor is helpful and valuable for the grading of glioma and differentiating glioma from metastatic carcinoma, lymphoma, and extra-axial tumors.
肿瘤内和肿瘤周围最大相对局部脑血容量变化可对胶质瘤分级及胶质瘤与转移瘤、淋巴瘤和轴外肿瘤的鉴别诊断提供帮助，具有较高的临床应用价值。
The maximum rrCBV in tumor and peri-tumor is helpful and valuable for the grading of glioma and differentiating glioma from metastatic carcinoma, lymphoma, and extra-axial tumors.
肿瘤内和肿瘤周围最大相对局部脑血容量变化可对胶质瘤分级及胶质瘤与转移瘤、淋巴瘤和轴外肿瘤的鉴别诊断提供帮助，具有较高的临床应用价值。
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