Arachnoid granulation

Case contributed by Dr Mohamed Abdel-Tawab Mohamed

Presentation

Headache.

Patient Data

Age: 50
Gender: Female
CT

A hypodense lesion is seen in the right transverse sinus

Case Discussion

Arachnoid granulations are small protrusions of the arachnoid mater through the dura into the venous sinuses of the brain and allow cerebrospinal fluid to exit the subarachnoid space and enter the bloodstream. The largest granulations lie along the superior sagittal sinus then the transverse sinus in arranging manner of frequency

Smaller granulations are called villi, large calcified ones are referred to as pacchionian bodies. They apepar as a filling defect in dural venous sinuses, which can be mistaken for dural venous thrombosis, however, it is seen in the non-contrast study (filling defects in the venous sinuses are assessed in the post contrast phase).

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Case information

rID: 56899
Published: 6th Dec 2017
Last edited: 7th Dec 2017
Inclusion in quiz mode: Included
Institution: Assiut University

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