Cerebrospinal fluid rhinorrhea (CSF) Etiology: Traumatic: latrogenic, and external trauma Intracranial or extracranial surgery Cribriform plate, sphenoid, frontoethmoidal complex Nontraumatic: Spontaneous (or primary) direct erosion or increased intracranial pressure (tumors, congenital or acquired hydrocephalus or infectionsCerebrospinal fluid rhinorrhea (CSF) Etiology： Traumatic: Iatrogenic, and external trauma. Intracranial or extracranial surgery. Cribriform plate, sphinoid, frontoethmoidal complex. Nontraumatic: Spontaneous (or primary), direct erosion or increased intracranial pressure (tumors, congenital or acquired hydrocephalus, or infections