Small rounded filling defect within the right transverse sinus, compatible with an arachnoid granulation.
Discussion
Arachnoid granulations are common, with a prevalence of approximately 60%.
They are protrusions of arachnoid through the dura mater, which allow CSF to extend from the subarachnoid space into the venous sinus or into the calvarium.
They most commonly occur in the superior sagittal and transverse sinuses.
On non-contrast head CT they are CSF density and on post-contrast imaging they appear as round, focal filling defect in the dural sinus. Usually they are small (<10mm), but occassionally can be “giant” (>10mm). If they involve the calvarium, they appear as a circumscribed lucent lesion.
Usually these granulations are easy to differentiate from thrombosis given their round, well-circumscribed appearance and typical location.
This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience.
This cookie is installed by Google Analytics. The cookie is used to calculate visitor, session, camapign data and keep track of site usage for the site's analytics report. The cookies store information anonymously and assigns a randoly generated number to identify unique visitors.
_gat_gtag_UA_109437689_1
0
1 minute
Google uses this cookie to distinguish users.
_gid
0
1 day
This cookie is installed by Google Analytics. The cookie is used to store information of how visitors use a website and helps in creating an analytics report of how the wbsite is doing. The data collected including the number visitors, the source where they have come from, and the pages viisted in an anonymous form.
GPS
0
30 minutes
This cookie is set by Youtube and registers a unique ID for tracking users based on their geographical location
YSC
1
This cookies is set by Youtube and is used to track the views of embedded videos.
Used by Google DoubleClick and stores information about how the user uses the website and any other advertisement before visiting the website. This is used to present users with ads that are relevant to them according to the user profile.
VISITOR_INFO1_LIVE
1
5 months
This cookie is set by Youtube. Used to track the information of the embedded YouTube videos on a website.
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.