Abstract
To evaluate which MR imaging sequence is the best and most useful neuroimaging the surgical anatomy of the posterior fossa, various MR imaging sequences, combined with the oblique sagittal or coronal imaging direction suitable for the lateral or midline suboccipital approach to the posterior fossa, were estimated. MR examinations were performed with a T1-weighted, a T2-weighted, a FLAIR, a heavily T2-weighted, and a reversed heavily T2-weighted sequence. As a result, it was detemined that the best MR imaging sequence was a reversed heavily T2-weighted image, because of its clear visualization of the cranial nerves, vertebro-basilar system, the IVth ventricle, cerebellum and brain stem, including the bony structure. A reversed heavily T2-weighted MR cisternography of oblique sagittal or coronal view is a useful planning aid.
