Preschooler with fever and right facial tenderness

CT of mastoiditis with dural venous sinus thrombosis
Axial CT with contrast of the brain with bone windows (left) shows complete opacification of the mastoid air cells bilaterally. MRV with contrast of the brain (right) shows a lack of venous flow in the right sigmoid sinus.

The diagnosis was acute mastoiditis with thrombosis of the right sigmoid sinus.