PT  - JOURNAL ARTICLE
AU  - McGuinness, B.J.
AU  - Morrison, J.P.
AU  - Brew, S.K.
AU  - Moriarty, M.W.
TI  - Benign Enhancing Foramen Magnum Lesions: Clinical Report of a Newly Recognized Entity
AID  - 10.3174/ajnr.A5085
DP  - 2017 Apr 01
TA  - American Journal of Neuroradiology
PG  - 721--725
VI  - 38
IP  - 4
4099  - http://www.ajnr.org/content/38/4/721.short
4100  - http://www.ajnr.org/content/38/4/721.full
SO  - Am. J. Neuroradiol.2017 Apr 01; 38
AB  - SUMMARY: Intradural extramedullary foramen magnum enhancing lesions may be due to meningioma, nerve sheath tumor, aneurysm, or meningeal disease. In this clinical report of 14 patients, we describe a novel imaging finding within the foramen magnum that simulates disease. The lesion is hyperintense on 3D-FLAIR and enhances on 3D gradient-echo sequences but is not seen on 2D-TSE T2WI. It occurs at a characteristic location related to the posterior aspect of the intradural vertebral artery just distal to the dural penetration. Stability of this lesion was demonstrated in those patients who underwent follow-up imaging. Recognition of this apparently benign lesion may prevent unnecessary patient anxiety and repeat imaging.