RT Journal Article SR Electronic T1 Unilateral Aplasia of the Middle Cranial Fossa Floor in Atypical Hemifacial Microsomia JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1434 OP 1437 VO 22 IS 7 A1 Raymond W. Sze A1 Joseph S. Gruss A1 Michael L. Cunningham YR 2001 UL http://www.ajnr.org/content/22/7/1434.abstract AB Summary: We present the first report of a patient with atypical hemifacial microsomia (HFM) and unilateral aplasia of the floor of the middle cranial fossa, glenoid fossa, and portions of her posterior fossa. The patient also developed a Chiari I malformation with cervical syrinx over a 3-year interval. This case report highlights the critical role of imaging in revealing serious, but clinically occult, structural abnormalities, as well as the evolution in the pathogenetic understanding of HFM.