[Cerebrospinal rhinorrhea in a tumor of the pituitary gland].

The authors report a case of rhinorrhoea caused by a hypophyseal tumour. The clinical pattern and the result of CT of the head might suggest a non-neoplastic aetiology of the cerebrospinal fluid fistula, but intraoperative findings and histological examination made possible establishing of the cause of the rhinorrhoea which was most likely perforation of a cyst of the hypophyseal tumour into the subarachnoid space with secondary development of the empty sella syndrome with consequent fistula leading off the cerebrospinal fluid into the nose.