@article {Armstrong666, author = {G.T. Armstrong and A.R. Localio and T. Feygin and L. Bilaniuk and P.C. Phillips and M.J. Fisher and B.L. Strom and R. Zimmerman}, title = {Defining Optic Nerve Tortuosity}, volume = {28}, number = {4}, pages = {666--671}, year = {2007}, publisher = {American Journal of Neuroradiology}, abstract = {BACKGROUND AND PURPOSE: Optic nerve tortuosity is one of several nonmalignant abnormalities documented on MR imaging in patients with neurofibromatosis type 1 and may be related to the development of optic pathway gliomas. This study seeks an operational definition for optic nerve tortuosity.MATERIALS AND METHODS: A focus group of 3 pediatric neuroradiologists reviewed 20 MR images of the brain and orbits of patients suspected to have optic nerve tortuosity in the absence of optic pathway glioma and found 6 radiographic factors that occurred frequently. Subsequently, 28 MR images were assessed for the presence of optic nerve tortuosity, using a global assessment question that reflects a neuroradiologist{\textquoteright}s confidence in the presence of optic nerve tortuosity, and for the presence of the 6 radiographic factors, to identify a combination of these factors that best predicted a diagnosis of optic nerve tortuosity.RESULTS: We found perfect inter-rater agreement between 3 readers on the presence/absence of tortuosity in 75\% of cases. Lack of congruity of the optic nerves, in more than 1 coronal section and dilation of the subarachnoid space surrounding the optic nerves, when found together are sensitive (89\%) and specific (93\%) for a diagnosis of tortuosity on the global scale. The absence of these 2 factors, along with absence of deviation of the optic nerve within the axial plane, provides a reliable test to exclude tortuosity.CONCLUSION: Lack of congruity of the optic nerves in more than 1 coronal section and dilation of the subarachnoid space surrounding the optic nerves together provide an operational radiographic definition of optic nerve tortuosity.}, issn = {0195-6108}, URL = {https://www.ajnr.org/content/28/4/666}, eprint = {https://www.ajnr.org/content/28/4/666.full.pdf}, journal = {American Journal of Neuroradiology} }