Carotid canal sympathetic schwannoma

Discussion:

Although extremely rare, sympathetic schwannoma of the carotid canal is the likely diagnosis in this case. The signal characteristics and smooth bone remodelling are in keeping with schwannoma. Internal carotid artery dissection would be a far more common pathology to involve the carotid canal however the appearance in this case is clearly of an extrinsic mass and not dissection. 

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