RT Journal Article SR Electronic T1 Syndromes of the First and Second Branchial Arches, Part 1: Embryology and Characteristic Defects JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 14 OP 19 DO 10.3174/ajnr.A2072 VO 32 IS 1 A1 J.M. Johnson A1 G. Moonis A1 G.E. Green A1 R. Carmody A1 H.N. Burbank YR 2011 UL http://www.ajnr.org/content/32/1/14.abstract AB SUMMARY: A variety of congenital syndromes affecting the face occur due to defects involving the first and second BAs. Radiographic evaluation of craniofacial deformities is necessary to define aberrant anatomy, plan surgical procedures, and evaluate the effects of craniofacial growth and surgical reconstructions. High-resolution CT has proved vital in determining the nature and extent of these syndromes. The radiologic evaluation of syndromes of the first and second BAs should begin first by studying a series of isolated defects: CL with or without CP, micrognathia, and EAC atresia, which compose the major features of these syndromes and allow more specific diagnosis. After discussion of these defects and the associated embryology, we proceed to discuss the VCFS, PRS, ACS, TCS, Stickler syndrome, and HFM. ACSauriculocondylar syndromeBAbranchial archCLcleft lipCL/Pcleft lip/palateCPcleft palateEACexternal auditory canalHFMhemifacial microsomiaMDCTmultidetector CTPRSPierre Robin sequenceTCSTreacher Collins syndromeVCFSvelocardiofacial syndrome