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MR imaging and enhancing patterns of meningeal metastasis from malignancy

DING Juan,TAO Xiao feng,XIAO Xiang sheng.Department of Radiology,Changzheng Hosptial of the Second Military Medical University,Shanghai 20003,P.R.China  
Objective:To analyze MR imaging features and enhancing patterns of meningeal metastasis by systemic malignancy,and assess their values for the diagnosis.Methods:There were 12 patients with meningeal metastasis confirmed by clinical data,CFS and pathology.The metastasis was from lung cancer in 5,mammary cancer in 3,melanoma in 1,lymphoma in 1 and unknown malignancy in 1.All patients were examined plain and enhanced MRI.Results:①Plain MRI: multiple nodules along leptomeninges in 2 cases.②Enhanced MRI:12 cases showed 3 kinds of enhancing patterns including dural enhanced pattern in 3 cases,leptomeninx enhanced pattern in 3 and dural leptomeninx enhanced pattern in 3.two of 12 cases revealed multiple nodules along leptomeninges and the remaining 10 showed diffusive linear enhancing meninges.③Other signs: there were cerebral metastasis in 3 and hydrocephalus in 3.Conclusion:Meningeal metastasis by systemic malignancy has 3 types of meninx enhancement on enhanced MRI,where leptomeninx enhanced pattern is usually seen.Moreover,nodules along meninges and cerebral metastasis may be of specificity.
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