Complete focal thrombosis of the distal right transverse venous sinus, extending in the sigmoid sinus and proximal internal jugular vein on the right, in a patient with a marked asymmetry of the transverse venous sinuses, markedly dominant on the right (thrombosed side).
There is complete opacification of the adjacent right mastoid air cells and middle ear cavity. Of note, both mastoids appear underdeveloped/under pneumatized, right more than left. There are small areas of bony demineralization versus lysis noted on the right especially at the inferior aspect of the mastoid medially.