Large arachnoid granulations involving the dorsal superior sagittal sinus: findings on MR imaging and MR venography.

AJNR. American Journal of Neuroradiology
J L LeachT A Tomsick

Abstract

Large arachnoid granulations (AG) within the dorsal superior sagittal sinus (SSS) have been incompletely characterized and can be confused with pathology. This report reviews the characteristics of these anatomic structures to establish common imaging features that allow differentiation from pathology. Twelve cases of large AG in the dorsal SSS are presented, identified by MR imaging. Signal intensity characteristics, size, location, venographic appearance, and association with adjacent venous and osseous structures were documented. A defect in the dura of the SSS was seen in all of the cases communicating with the subjacent subarachnoid space. The average size of the AG was 8.1 x 9.4 x 10.0 mm (range, 4-19 mm). Ten produced calvarial remodeling, and 11 were in the direct vicinity of the lambda. On T2-weighted images, all were hyperintense to the brain. On T1-weighted images, 8 were hypointense and 4 were hypointense with mixed areas of isointense signal intensity. All of the AGs were associated with cortical venous structures entering the sinus. On MR venography, AGs appeared as focal protrusions into the sinus, displacing, distorting, and narrowing the sinus lumen. Seven patients had headache without other visible cause on MR...Continue Reading

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Citations

Sep 6, 2012·Pediatric Radiology·Jennifer BrackenMichael Ditchfield
Jul 30, 2011·The Indian Journal of Radiology & Imaging·Divyata HingwalaTirur Raman Kapilamoorthy
Aug 18, 2012·World Journal of Radiology·Chao-Xuan LuYun-Hong Tian
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