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1 Department of Neurosurgery, Tsukuba Memorial Hospital, Ibaraki 305, Japan.
2 Department of Radiology, Tsukuba Memorial Hospital, Ibaraki 305, Japan.
3
Present address: Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba Science City, Ibaraki 305, Japan. Address reprint requests to Y. Komatsu at University of Tsukuba.
Received 1988 Jul 21; Revision requested 1988 Sep 8; Revised 1988 Dec 11; Accepted 1988 Dec 28.