The article presents a case study of a 22-year-old girl who has experienced headache and diabetes insipidus for two months. The patient was found to have no neurological deficit except for the right anosmia. She underwent right frontal craniotomy, which revealed a slightly yellowish and smooth capsule of tumor with clear border. The histological examination confirmed that the tumor cells were positive for S-100 protein and leu7, which are symptoms of schwannomia.