How does the venous system drain from the head?
This is often forgotten but is important in situations like this! They sit in the dural layers and bridging veins (that get torn in subdural haematomas) feed into a number of sinuses. The superior sagittal sinus, inferior sagittal sinus and Vein of Galen all run along the lining of the brain in the midline meeting at the occiput. Then two transverse sinuses travel along the skull to the sigmoid sinuses which drain into the internal jugular vein (you should recognise this vessel at least!).
This again is a normal scan. There are a few small hypodense areas in the contrast rich veins but these are not clots, instead the arachnoid granulations that "suck up" the excess CSF.
If there was a clot, we would see a big hypodense dark space in a sinus (or more than one) - and this would usually correspond with a hyperdense area in non-contrast CT. With contrast, you can sometimes see collateral vessels in the areas which are clotting.