Giant arachnoid granulation

Case contributed by Dr Ammar Haouimi

Presentation

Chronic headaches

Patient Data

Age: 15 years
Gender: Female
MRI

There is a rounded well-defined lesion (13 mm) within the posterior aspect of the superior sagittal sinus (SSS) of low signal intensity on T1WI/FLAIR, high signal intensity on T2WI with no enhancement on the postcontrast sequence. The MRV (2D-TOF) shows a focal filling defect of the SSS at the same level. Note small intrinsic vessels crossing this lesion on the post-contrast sequence which represents displaced cortical veins or channels.

A small pineal cyst (12 mm) is noted of low signal on T1WI, high signal on T2WI with no restricted diffusion (incidental finding).

Case Discussion

Giant arachnoid granulation within the superior sagittal sinus which is a normal finding and should not be mistaken for a dural venous thrombosis.

Intrinsic vessels within giant arachnoid granulations are described in the literature and appear to be displaced cortical veins or channels 1.

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Case information

rID: 71367
Published: 2nd Oct 2019
Last edited: 3rd Oct 2019
Inclusion in quiz mode: Included
Institution: Aurès Medical Imaging Center - Batna Algeria

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