Table 5 (abstract P116). Secondary mimics of NDPH

• Low or raised CSF pressure(Spontaneous CSF leak, Idiopathic intracranial hypertension, Intracranial mass lesion )

• Cerebral venous thrombosis

• Cranial artery dissection

• Cranial arthritis

• Posttraumatic headache (subarachnoid hemorrhage, subdural hematoma,…)

• Meningitis

• Sphenoid sinusitis

• Contact-point headache(caused by contact of intranasal structures)