Striking feature of the following condition is:
Mandibulofacial Dysostosis (Treacher Collins Syndrome)
A 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.
Hypoplastic zygomatic bone
Absent zygomatic bone
Hypoplasia of lateral aspect of orbit
All of the above