Summary of useful radiological data to distinguish between hypertropic Paccioni granulation and thrombus within dural venous sinuses1 4
| Dural venous with | Recent thrombosis | hPg |
| Aspect | Irregular, in entire segment of a sinus. | Round, regular well limited mass, impression in the skull |
| Preferential topography | None | Lateral transverse sinus in the vicinity of venous entrance |
| CT: | ||
| Without contrast enhancement | Cord sign or spontaneous sinus hyperdensity. Indirect signs. | Never sinus hyperdensity. |
| With contrast enhancement | Delta sign or large defect within dural sinus. Abnormal cortical vein opacification. Indirect signs. | Hypodense or isodense relative to brain. Not contrast enhancement of the mass. |
| MRI: | ||
| T1 weighted images | Early, isointense then hyperintense signal. Indirect signs. | Hypointense or isointense signal |
| T2 weighted images | Early, hypointense the hyperintense signal. Indirect signs. | Hyperintense signal |
| Signal varying with time of onset | Yes | Never |
| Contrast enhanced T1 weighted images | Dural enhancement. indirect signs. | No or heterogeneous contrast enhancement. |
| MR venogramm | Absence of the flow distally to the occlusion. Abnormal visualisation of collateral veins. | Normal flow distally and proximally to the mass. |
Indirect radiological signs classically associated with venous thrombosis can be brain swelling, brain oedema, haemorrhagic stroke, visualisation of cortical veins or dural contrast enhancement.4