嗅神经母细胞瘤的MRI评价

目的：评价ＭＲＩ在嗅神经母细胞瘤诊断中的价值。材料与方法：对３例经手术病理证实的嗅神经母细胞瘤ＭＲＩ表现行回顾性分析。检查序列为ＳＥ序列，且均行Ｇｄ－ＤＴＰＡ增强扫描。结果：本组３例嗅神经母细胞瘤中，２例病灶起源于鼻腔顶部，１例起源于嗅沟，均侵犯筛窦和前颅凹，其中２例累及同侧眼眶、蝶窦。与脑组织的信号相比，２例ＭＲＩＴ１ＷＩ呈低信号，Ｔ２ＷＩ呈高信号，病灶均匀强化；１例Ｔ１ＷＩ呈等，低信号，Ｔ２Ｗ

Evaluation of MRI in Diagnosing Esthesioneuroblastoma

Purpose: To evaluate the value of MRI in diagnosis of esthesioneuroblastoma. Materials and Methods: 3 cases of esthesioneuroblastoma proven by surgery and/or pathology were analyzed retrospectively. MRI was done in 3 case with SE pulse sequence, T1 and T2, weighted and Gd - DTPA enhanced TI weighted images. Results: According to Kadish staging, there were 3 cases with stage C. 2 cases were originated from the top of nasal cavity, 1 case was originated from the groove of olfactory nerve. Anterior cramal fossae were aggregated in 3 cases. Tumor involvement included nasal cavity, ipsilateral ethmoid sinus, sphenoid sinus, and maxillary sinus in 2 cases. The orbits were involved in 1 cases. Tumor signal was lower than that of brain tissue in T1WI, and was higher than that of brain tissue in 2 cases. In T1 weighted MRI scan, tumor signal was of iso and hypointensity, In T2 weighted MRI scan, tumor signal was of iso and hyperintensity in 1 case. After injection of Gd - DTPA, all tumors were enhanced in 3 cases. Conclusion: MRI can accurately define the area of olfactory neuroblastoma involvement, especially the area of soft tissue, and tumor staging. It is very helpful in planning the optional treatment for the clinics.