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目的：探讨骶神经根囊肿的影像学特点，提高临床诊断水平。材料和方法：对68例骶神经根囊肿的MRI（35例）、CT（16例）、X线脊髓造影（29例）和X线平片（68例）等影像学特征进行回顾性分析。结果：X线平片一般不能检出骶神经根囊肿。脊髓造影一般能清楚显示神经根囊肿。CT扫描能显示骶管扩大、骶骨椎板变簿、椎体后缘凹陷性侵蚀性改变。MRI能清楚显示骶骶神经囊肿的位置、大小和形态，可做出定性诊断。结论：脊髓造影、MR和CT对本病诊断和鉴别诊断具有重要的临床价值；由于CT受扫描范围的限制和囊肿大小的影响，有时易发生漏诊。
Objective: To investigate the imaging features of radial nerve root cysts and improve clinical diagnosis. Materials and Methods: 68 cases of sacral nerve root cysts were retrospectively analyzed with MRI features (35 cases), CT (16 cases), X-ray myelography (29 cases) and X-ray plain film (68 cases). RESULTS: X-ray radiographs generally failed to detect sacral nerve root cysts. Myelography usually shows clearly the nerve root cyst. The CT scan can show the enlargement of the fistula, the book of the tibial lamina, and the erosion of the depression of the vertebral body. MRI can clearly show the location, size, and morphology of sacral cysts and can make a qualitative diagnosis. Conclusion: Myelography, MR and CT have important clinical value in the diagnosis and differential diagnosis of this disease. Due to the limited scope of CT scan and the influence of the size of cyst, it is sometimes easy to miss the diagnosis.