The problem of differentiating tumours secondarily invading the meninges from primary meningiomas.
D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002339:Carotid Arteries; D003937:Diagnosis, Differential; D006801:Humans; D008579:Meningioma / Q000000981:diagnostic imaging*; D011859:Radiography