Arachnoid granulation (straight sinus)

Case contributed by Bruno Di Muzio
Diagnosis almost certain


Normal prominent structure found in the straight sinus. SCan otherwise unremarkable.

Patient Data

Age: 25 years
Gender: Female

MRI Brain (selected images)


Prominent arachnoid granulation within the straight sinus. 

Case Discussion

Arachnoid granulations, also known as a Pacchionian granulation, are projections of the arachnoid membrane (villi) into the dural sinuses that allow CSF entrance from the subarachnoid space into the venous system.

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