From the Departments of *Pathology and †Radiology, Helsinki University Central Hospital, University of Helsinki, Finland, the ‡Department of Pathology, Haartman Institute, University of Helsinki, Finland, and the §Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland.
Received October 23, 1998, and
Reprint requests: Timo Paavonen, Department of Pathology, Haartman Institute, University of Helsinki, P.O. Box 21, FIN-00014 Helsinki, Finland.
Supported by State Subsidy for University Hospitals, a research grant from Helsinki University Central Hospital (HJA, TP, OT), Cancer Organizations of Finland (HJA, TP, OT), Vuorisalo Foundation (HJA), and Paulo Foundation (HJA), Helsinki, Finland.
The authors thank Hilkka Toivonen for excellent technical advice.
