Fig. 16

Post-operative follow-up demonstrating intracranial involvement in a case of ROCM. Axial CT image (a) of the neck reveals mild soft tissue in the right retro-antral (thin arrow). Axial T2-FS image (b) confirms the soft tissue occupying the right retro-antral fat (thin arrow) and PPF (dotted arrow). Axial constructive interference in steady state (CISS) sequence (c) obtained for the evaluation of the cranial nerves demonstrates thickening of the right trigeminal nerve (thick arrow). Note the lateral convexity of the right cavernous sinus (arrow head). CE FS T1W image (d) reveals dural thickening and non-enhancement of the right cavernous sinus in keeping with thrombosis (arrow head). Enhancement of the cisternal portion of the right trigeminal nerve (thick arrow in d) is also seen, suggestive of intracranial perineural spread