Onbas et al. observed. The recent development of MDCT, which can quickly scan a large longitudinal area and enable us to obtain thinner section collimation within a short period of time, allowed us to obtain isotropic volume data for 3D imaging. The volume data obtains serviceable 3D images by using various reconstruction methods such as high-quality MPR, MIP algorithm, surface rendering and volume rendering. Sixteen-slice scanners can shorten the duration of scanning as well. By using thick MPR techniques, image quality can be improved while keeping patient dose low. Reconstructing overlapping thin-section data provides the basis for image reconstruction in any desired plane. Proper reconstructions, 3D images and postprocessing allow better visualization of structures and their normal and abnormal morphologic features (8). In conclusion, sphenoid dysplasia is one of the features of NF-1, but the absence of a sphenoid wing is very rare. By using MDCT, we were able produce good axial and 3D images of the sphenoid bone and the surrounding area. References 1. Haik BG, Pohlod M. Severe enophthalmos following intracra- nial decompression in a von Recklinghausen patient. Clin Neuroophthalmol 1993;13:171-174 2. Jacquemin C, Bosley TM, Liu D, Svedberg H, Buhaliqa A. Reassessment of sphenoid dysplasia associated with neurofibro- matosis type 1. AJNR Am J Neuroradiol 2002;23:644-648 3. Jacquemin C, Mullaney P, Bosley TM. Abnormal development of the lesser wing of the sphenoid with microphthalmos and microcephaly. Neuroradiology 2001;43:178-182 4. Harkens K, Dolan K. Correlative imaging of sphenoid dysplasia accompanying neurofibromatosis. Ann Otol Rhinol Laryngol 1990;99:137-141 5. Huson S, Jones D, Beck L. Ophthalmic manifestations of neurofibromatosis. Br J Ophthalmol 1987;71:235-238 6. Romanowski CA, Cavallin LI. Neurofibromatosis types I and II: radiological appearance. Hosp Med 1998;59:134-149 7. Macfarlane R, Levin AV, Weksberg R, Blaser S, Rutka JT. Absence of the greater sphenoid wing in neurofibromatosis type I: congenital or acquired: case report. Neurosurgery 1995;37:129-133 8. Prokop M. Multislice CT: technical principles and future trends. Eur Radiol 2003;5:3-13 72 Korean J Radiol 7(1), March 2006