<prompt> Striking feature of the following condition is:Hypoplastic zygomatic boneAbsent zygomatic boneHypoplasia of lateral aspect of orbitAll of the above  <response>: Mandibulofacial Dysostosis Treacher Collins SyndromeA striking finding is the hypoplastic or absent zygomatic bones, and hypoplasia of the lateral aspects of the orbits. The auditory canal, mastoid air cells, and articular eminence often are smaller than normal or absent. The maxilla and especially the mandible are hypoplastic, showing accentuation of the antegonial notch and a steep mandibular angle, which gives the impression that the body of the mandible is bending in an inferior and posterior direction. The ramus is especially short. The condyles are positioned posteriorly and inferiorly. The maxillary sinuses may be underdeveloped or absent. 