=====Rhinoliquorrhoea=====
Rhinoliquorrhoea suggests a communication between the [[subarachnoid space]] and the [[sinonasal tract]]. Clinical presentation includes clear nasal discharge, [[headache]], [[pneumocephalus]], [[meningitis]] or [[brain abscess]]. [[Cerebrospinal fluid leak]]s are mostly of traumatic origin ([[skull base fracture]]s), iatrogenic (secondary to [[endoscopic endonasal surgery]]) or associated with tumour aetiology. Occasionally, [[hydrocephalus]] has been the cause of rhinoliquorrhoea in adults, presumably secondary to the chronically [[raised intracranial pressure]] with skull base erosion and meningocele.