✓ This report describes the clinical, roentgenological, and histopathological findings in 13 patients in whom the preoperative roentgen diagnosis was tumor of the vermis cerebelli but in whom no neoplasm was found at operation nor suggested by postoperative course. There was a striking clinical conformity; the majority of the patients were between 50 and 70 years of age, had a history of rheumatoid arthritis and/or cardiovascular disease, and a histological picture characterized by small cavernous-capillary hemangiomas and spongiosis indicating perifocal edema. The pathogenesis and clinical significance of the lesions are discussed.
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