目的 探讨脊柱单纯硬膜外海 绵状血管瘤(Pure spinal epidural cavernous hemangiomas，PSECHs)的MRI 特征。方法 回顾分析手术病理证实的8 例PSECHs的临床资料及MRI征象。结果 8 例患者中，位于颈胸段者2例，位于胸段 者3例，位于胸腰段者2例，位于腰段者1 例。7例均发生于硬膜囊背侧，1例发生 于硬膜囊右侧。纺锤状形态者6例，结节 状者2例。病灶信号强度在T1WI基本上呈 等或略低信号，T2WI 呈高或不均匀高信 号；增强扫描病灶均匀强化及不均匀环状 强化。2例病灶内可见斑点状短T1、稍长 T2脂肪信号影。2例PSECHs伴血肿形成， 血肿呈短T1、短T2信号。6例脊髓明显受 压，轴位T1WI病灶呈“钳”包绕脊髓。结 论 PSECHs虽是少见肿瘤样病变，根据病 变的定位、形态、信号强度及强化特征， 结合临床资料，可作出较为准确的诊断。

Objective To investigate the MRI characteristics of pure spinal epidural cavernous hemangiomas (PSECHs). Methods Clinical data and MRI signs of 8 patients with PSECHs confirmed by surgical pathology were retrospectively analyzed. Results Among the 8 patients, 2 with PSECHs in the cervicothoracic segments, 3 in the thoracic segments, 2 in the thoracolumbar segments, and 1 in the lumbar segments. Additionally, PSECHs occurred in the dorsal part of the dural sac in 7 patients, and in the right side of the dural sac in 1 patient. Moreover, PSECHs presented spindle morphology in 6 patients and nodular shape in 2 patients. The lesions showed isointensity or slightly low signal intensity on T1WI, and presented high or inhomogeneous high signal intensity on T2WI; enhancement scanning of the lesions demonstrated homogeneous enhancement and inhomogeneous ring-like enhancement. Furthermore, spotted short T1 and slightly long T2 fat signal shadows were detected in the lesions of 2 patients. PSECHs of 2 patients were accompanied with hematoma formation, showing short T1 and short T2 signals. Obvious compression on the spinal cord was found in 6 patients, and lesions on the axial T1WI presented a "pincer-like structure" wrapping around the spinal cord. Conclusion Although PSECHs are rare tumor-like lesions, they can be accurately diagnosed according to the location, morphology, signal intensity and enhancement characteristics of lesions combined with clinical data.