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Evidence of left mastoid lesion measuring 1.2 x 3 cm expressing T1 hypointense signal and T2 bright signal. No post-gadolinium enhancement. It showed marked diffusion restriction, best seen on HASTE diffusion-weighted (non echo-planar) sequence.
It shows overlying 9 mm calvarial defect at the occipitomastoid suture and wide destruction of the sigmoid plate. There is thick enhancing granulation tissue at the interface with the sigmoid sinus posteriorly. No labyrinthine or other intracranial lesions.
Loss of signal void on coronal T2 images of the left sigmoid and distal left transverse sinuses suggestive of sigmoid thrombophlebitis.