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目的：探讨ＣＴ和ＭＲ对颅内巨大动脉瘤的诊断价值。方法：８ 例颅内巨大动脉瘤病人进行了ＣＴ和ＭＲ检查，并经血管造影和手术证实。其中，男４ 例，女４ 例，年龄３４～７２岁，平均５４岁。临床上５例表现为颅内占位症状，３例为蛛网膜下腔出血症状。结果：５例动脉瘤起源于颈内动脉，２ 例起源于大脑中动脉，１例起源于椎基底动脉。ＣＴ和ＭＲ表现如下：（１）ＣＴ平扫病灶呈稍高密度圆形阴影，密度可均匀或不均匀，增强扫描病灶明显强化。（２）ＭＲ扫描显示残存瘤腔在Ｔ１ＷＩ及Ｔ２ＷＩ上均呈无信号区，周围为混合信号带。该信号带在Ｔ１ＷＩ上信号稍高于脑灰质，在Ｔ２ＷＩ上则稍低于脑灰质。增强扫描部分病例动脉瘤壁及混合信号带有强化表现。（３）动脉瘤破裂时，ＣＴ与ＭＲ可显示相应出血表现。结论：对颅内巨大动脉瘤的诊断，ＭＲ优于ＣＴ，尤其在显示瘤腔和血栓方面ＭＲ有独到之处
Objective: To investigate the diagnostic value of CT and MR in intracranial giant aneurysms. Methods: Eight patients with giant intracranial aneurysm underwent CT and MR examinations and confirmed by angiography and surgery. Among them, 4 males and 4 females, aged 34 to 72 years, with an average of 54 years old. Clinical manifestations of 5 cases of intracranial space-occupying symptoms, 3 cases of subarachnoid hemorrhage. Results: Five cases of aneurysm originated from the internal carotid artery, two from the middle cerebral artery, and one from the vertebrobasilar artery. CT and MR showed the following: (1) CT plain lesions showed a slightly higher density of circular shadows, the density can be uniform or uneven, enhance the enhanced scan lesions significantly. (2) MR scan showed that the residual tumor cavity showed no signal area on both T1WI and T2WI, and the mixed signal band around it. This signal has a slightly higher signal on T1WI than gray matter and slightly lower than gray matter on T2WI. Enhanced scanning in some cases aneurysm wall and mixed signal with enhanced performance. (3) aneurysm rupture, CT and MR can show the corresponding bleeding performance. CONCLUSIONS: MR is superior to CT in the diagnosis of intracranial giant aneurysms, especially in MR manifestations of tumor linings and thrombi