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Two cases of nontraumatic cerebrospinal fluid rhinorrhea were presumed to be an indirect manifestation of brain tumor. One patient had a parietal convexity meningioma and the other a cerebello-pontine angle neurinoma. Following excision of the tumors these patients spontaneously developed cerebrospinal fluid rhinorrhea, which disappeared after the repair of fistulas at the base of the frontal fossa. In such cases the rhinorrhea may be caused by fragility of certain structures as a consequence of long-standing increased intracranial pressure due to brain tumor.