颅内神经元肿瘤的影像诊断

目的 探讨颅内神经元肿瘤的影像学表现，评价CT和MRI对该类肿瘤的诊断价值。方法 经手术不病理证实的神经元肿瘤10例，回顾分析其CT及MRI表现，结果 节细胞胶质瘤3例；中枢神经细胞瘤3例；胚胎发育不良性神经上上皮肿瘤（DNT）3例（7个病灶），肿瘤外形呈脑回状或结节脑回状，2个局灶性者呈中度强化，其余无明显强化。多纤维组织性婴儿节细胞胶质瘤（DIG）1例，病灶囊变明显，可见钙化，肿瘤实体明显均匀强化，结论 部分神经元肿瘤CT及MRI表现具有一定的特征性，但仅造影像学表现作出诊断是困难的，须结合临床资料，可进一步提高该类肿瘤的诊断正确率。

Imaging diagnosis of neuronal tumor

Objective To study imaging features of neuronal tumors, and to evaluate the value of CT and MRI in diagnosing these tumors. Methods The CT and MRI studies in 10 patients with pathologically proved neuronal tumor were retrospectively reviewed. Results (1) CT showed a mixed attenuation cystic solid mass with calcification in 3 gangliogliomas; The mixed signal intensity on T 1 or T 2WI with heterogeneous contrast enhancement was common in ganglioglioma. (2)Three central neurocytomas had mixed signal intensity. (3)Three dysembryoplastic neuroepithelial tumor (DNT) had decreased signal intensity on T 1 weighted MR images and well demarcated increased signal intensity on T 2 weighted images without peritumoral edema and calcification. Prominent MR imaging features were a gyriform configuration on T 1 or T 2WI. The tumor contrast enhancement was not common; (4)A desmoplastic infantile ganglioglioma (DIG) was located in the frontal and parietal lobes, appearing as cystic tumors with a solid cortical component enhanced intensely. Conclusion Some neuronal tumors possess of specific imaging features, but diagnosis of the tumor with imaging modalities alone may be difficult. Therefore, combined clinical history could help to establish a correct diagnosis.