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Rafael Vara-Lopez and Rafael Vara-Thorbeck

✓ Investigations of enzymatic activity in the human cerebrospinal fluid have shown a general and pathological increase in patients with intracranial tumors. The variation in components suggests the value of a diagnostic study of enzymes whenever brain tumors are presumed to exist.

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Jesús Vaquero, Roberto Martínez, Eduardo Rossi, and Rafael López

✓ A case of primary cerebral lymphoma is presented. The particular biological features of these tumors may pose a special problem. In this case, the lesion was diagnosed on computerized tomography (CT) but was not found at surgery. The disappearance of the lesion was associated with a long period of corticosteroid therapy between CT diagnosis and the operation.