Suspect in patients with headache, signs of increased ICP, or focal neurologic deficits, especially if any of above predisposing factors are present
MRI and MRV are considered diagnostic study of choice
CT venography is a reasonable alternative if there is a contraindication to MRV and may have a similar sensitivity to MRV in recent studies
May see "Empty delta sign" dense triangle in superior sagittal sinus
Cord sign: thrombus in the<unk>  sinus may appear as a hyperattenuated foci. It is homogenous in nature and appears linear or round based on the affected sinus. This is most commonly seen in the first week. 
Vein Sign: After two weeks, the thrombus becomes hypoattenuated. When the thrombus is located in the deep vein it is referred to as the vein sign. 
Non contrast CT possesses insufficient sensitivity or specificity to be of diagnostic value in the setting of high clinical suspicion
May see "dense delta sign" (hyperattenuation consistent with thrombus in the posterior sagittal sinus)
May see "Empty delta sign" dense triangle in superior sagittal sinus
Cord sign: thrombus in the<unk>  sinus may appear as a hyperattenuated foci. It is homogenous in nature and appears linear or round based on the affected sinus. This is most commonly seen in the first week. 
Vein Sign: After two weeks, the thrombus becomes hypoattenuated. When the thrombus is located in the deep vein it is referred to as the vein sign. 
May see "dense delta sign" (hyperattenuation consistent with thrombus in the posterior sagittal sinus)
D-Dimer is not a reliable test to rule out a<unk> 
In patients with a concern for meningitis then pursue diagnosis via standard workup which includes a CT before lumbar puncture
Cerebral venous thrombosis
Migraine headache
Brain abscess
Tension headache
Subarachnoid hemorrhage
Cluster headache
Vertebral and carotid artery dissection
Meningitis/encephalitis