In 37 patients with a tumor of the posterior cranial fossa, the immunologic indices of the spinal fluid, blood serum and tumor contents were studied. It was established that changes in the immunologic indices (intrathecal synthesis of IgG and IgA, production of the immunoregulatory factors of cellular immunity, severity of lesion of the brain structures) depended on a degree of tumor anaplasia and age of the patients. These findings can be used for diagnosis of cerebral neoplasms of different degree of malignancy with regard for the age of a patient.
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