Left temporo-parieto-occipital haematoma with intraventricular extension and likely small subdural extension, as suggested by high density material along the left side of the tentorium and the posterior falx cerebri. Subsequent rightward midline shift and early hydrocephalus, as indicated by dilated right temporal horn.
Hyperdensity of the left transverse sinus, left sigmoid sinus, and left internal jugular vein on non-contrast imaging, in conjunction with non-opacification of these structures on venogram, is consistent with cerebral venous sinus thrombosis. Hyperdensity and distension of the left superior ophthalmic vein on non-contrast imaging, with asymmetric opacification on venogram, suggests thrombosis. Non-opacification of the posterior left cavernous sinus is suspicious for further thrombosis.