【摘要】 目的探讨颅内黑色素瘤的MRI特征。方法回顾性分析11例经手术病理证实的颅内黑色素瘤的MRI表现。结果11例颅内黑色素瘤,共15个病灶,有14个位于幕上,10个病灶伴有出血,4个病灶局部囊变,大部分病灶有不同程度的水肿。颅内黑色素瘤MRI信号表现为:8个病灶T1WI为高信号、T2WI为低信号,3个病灶以T1WI为等信号、T2WI为低信号表现为主的混杂信号,2个病灶以等T1、等T2为主的混杂信号,2个病灶T1WI为低信号、T2WI为高信号;增强后均有不同程度的强化。结论颅内黑色素性黑色素瘤MRI具有特征性的表现,对于无黑色素性黑色素瘤MRI表现无明显特征,诊断困难。更多还原

【Abstract】 Objective To investigate the MR characteristics of intracranial melanoma.Methods MR findings in 11 patients with intracranial melanomas verified by operation and pathology were analyzed retrospectively.Results Fifteen lesions were found in 11 patients,among which 14 were located at supratentorial and 1 at infratentorial compartment.Ten lesions accompanied with hemorrhage and 4 with cystic degeneration.Most of lesions had peri-tumor edema in different degrees.Eight lesions demonstrated typical signal intensity which were hyperintensity on T1WI and hypointensity on T2WI,while nontypical signal intensity aslo appeared such as isointensity on T1WI and hypointensity on T2WI or isointensity on both T1WI and T2WI,or even hypoingtensity on T1WI and hyperintensity on T2WI.Different degrees of contrast-enhancement of lesions were demonstrated on contrast-enhanced MR scans.Conclusion Typical intracranial melanoma is easy to get correct diagnosis preoperatively,but the diagnosis of nontypical lesions is difficult.更多还原