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Left translabyrinthine craniectomy with fat packing. The surgical bed is filled predominantly with low-density fluid, with a small amount of high-density material medially likely blood products. Further high-density along the left tentorium cerebelli is likely also blood product. A small amount of pneumocephalus is seen.
High density in the region of the left transverse sinus is suspicious for thrombosis. The differential is post-surgical blood. There is no evidence of acute ischaemia or intraparenchymal haemorrhage. No hydrocephalus.
High density in the left transverse sinus may represent venous sinus thrombosis. Correlation with CT (or MR) venogram should be performed if there is clinical concern.