Sigmoid sinus wall dehiscence

Case contributed by Varun Babu
Diagnosis certain


Left chronic otitis media for HRCT temporal bone evaluation to rule out underlying cholesteatoma.

Patient Data

Age: 35 years
Gender: Male

Temporal bone


Lateral projection of the sigmoid sinus posterior the mastoid air cells resulting in rarefaction of the right occipital calvarium, a finding incidentally detected in this plain HRCT of temporal bones. 

Case Discussion

Sigmoid sinus wall dehiscence and diverticuli are a common etiology for pulsatile tinnitus especially when the wall dehiscence is seen anteriorly in relation to the mastoid temporal bone. One must keep in mind this anatomic variance as a differential when dealing with chronic inflammation of ear and mastoid that results in skull bone rarefaction. 

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