The CSF fistula is a postoperative event in around 30% of the skull base surgeries and should be correctly diagnosed to avoid severe complications as meningitis. In the last decades, the otorhinolaryngologist has developed an important role in this condition in the diagnosis and treatment by repairing the fistula. This article presents a case of a patient who underwent an endonasal surgery of the skull base and had presented a clinical behavior similar to CSF fistula. It is believed that the pseudo CSF fistula happens because of a dysfunction of the autonomic innervation of the nasal glands and a consequent increased activity parasympathetic. The otorhinolaryngologist must be aware of this problem and should consider it in the differential diagnosis of CSF fistula. The analysis of nasal fluid for glucose levels in an important and easy method to diagnose CSF fistula and must be done before the corrective surgery.
CSF rhinorrhea; vasomotor; rhinitis