4COURCILLE C B J.Cancer[M].4th ed.Philadelphia:WB Saunders Company,1996:2 659.
5KYRITSIS A P,LEVIN V A,YUNG W K,et al.Imaging patterns of multifocal gliomas[J].Eur J Radiol,1993,16(3):163-170.
6CHAKRABORTTY S,NAGASHIMA T,SAITOH M,et al.Intracerebral ring-enhancing lesions in a patient with multiple sclerosis:a case report[J].Surg Neurol,1995,43(6):591-594.
7BARNARD R O,GEDDES J F.The incidence of muhifocal cerebral gliomas.A histologie study of large hemisphere sections[J].Cancer,1987,60(7):1 519-1 531.