总结颈部动脉夹层（CAD）所致脑卒中患者的高分辨磁共振成像（HR-MRI）特点和应用价值。

收集2017年12月至2021年6月首都医科大学附属北京朝阳医院CAD所致的急性缺血性脑卒中的6例患者的临床及影像学资料，所有患者均经HR-MRI确诊并随访。

患者年龄29~45岁，男性6例，均急性起病，3例存在诱因。临床表现为头晕4例，言语不利3例，肢体无力2例，视物模糊、肢体麻木、吞咽困难、颈部疼痛各1例。影像学检查显示颈内动脉夹层3例，病变均位于大脑中动脉供血区，椎动脉夹层3例，病变位于小脑及丘脑。首次HR-MRI检查均可见高信号血肿，3例可见内膜瓣或双腔。随访HR-MRI显示4例血肿完全吸收，1例大部分机化，1例未见吸收。治疗后，6例患者均预后良好，

HR-MRI能够直观显示壁内血肿及内膜瓣等夹层的直接征象，可用于颈部动脉夹层的诊断及随访。

To summarize the high-resolution magnetic resonance imaging (HR-MRI) features of stroke patients caused by cervical artery dissection (CAD).

Clinical and imaging data were collected from 6 patients admitted to Beijing Chao-Yang Hospital, Capital Medical University due to acute ischemic stroke caused by cervical artery dissection from December 2017 to June 2021. All patients were confirmed by HR-MRI and followed up with HR-MRI.

The patients were aged from 29 to 45 years, all males and acute onset, with obvious inducement in three among them. The clinical manifestations were dizziness in 4 cases, speech impairment in 3 cases, limb weakness in 2 cases, blurred vision, limb numbness, dysphagia, and neck pain in 1 case each. Imaging examination showed internal carotid artery dissection in 3 cases, with lesions located in the middle cerebral artery area, and vertebral artery dissection in another 3 cases, with lesions located in the cerebellum and thalamus. HR-MRI examination showed intramural high signal hematoma in all 6 cases, with 3 cases showed intimal flap or double lumen. Follow up HR-MRI showed complete absorption of the hematoma in 4 cases, organized in 1 case, and no absorption in 1 case. After treatment, all 6 patients had a good prognosis.

HR-MRI can visually display intramural hematoma and the visual signs of dissection. HR-MRI can be used for the diagnosis and follow-up of cervical arterial dissection.