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AJNR - American Journal of Neuroradiology

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Evaluation of Platybasia with MR Imaging

Robert A. Koenigsberg^a,b, Nakul Vakil^a,b, Tom A. Hong^a,b, Tun Htaik^b, Eric Faerber^c, Tina Maiorano^a,b, Monica Dua^a,b, Scott Faro^b and Carlos Gonzales^b

^a Department of Radiologic Sciences, Drexel University College of Medicine, Philadelphia, PA
^b Department of Neuroradiology, Hahnemann University Hospital, Philadelphia, PA
^c St. Christopher’s Hospital for Children, Philadelphia, PA

View larger version (30K): [in a new window]   FIG 1. Standard MR imaging technique for measuring the basal angle. This technique involves measuring the angle formed by two lines—one joining the nasion with the center of the pituitary fossa and a second line joining the anterior border of the foramen magnum with the center of the pituitary fossa.

View larger version (40K): [in a new window]   FIG 2. Modified MR imaging technique for measuring the basal angle. This method uses different landmarks—the angle formed by a line extending across the anterior cranial fossa to the tip to the dorsum sellae with a second, connecting line drawn along the posterior margin of the clivus.