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What is the normal size of arachnoid granulations?
Normal size of arachnoid granulations is 2-9 mm in diameter. Occasionally they exceeds 1cm in diameter called giant arachnoid granulation.
Non-enhanced axial CT shows well-defined hypoattenuating areas in the bilateral sigmoid sinuses.
Contrast enhanced axial/coronal/sagittal CT shows well-defined nodular filling defects within the bilateral sigmoid sinus.