title: Diagnostic imaging of posterior fossa anomalies in the fetus and neonate: part 2, Posterior fossa disorders.
abstract: This second portion of a two-part review illustrates examples of posterior fossa disorders detectable on prenatal ultrasound and MRI, with postnatal or pathology correlation where available. These disorders are discussed in the context of an anatomic classification scheme described in Part 1 of this posterior fossa anomaly review. Assessment of the size and formation of the cerebellar hemispheres and vermis is critical. Diagnoses discussed here include arachnoid cyst, Blake's pouch cyst, Dandy-Walker malformation, vermian agenesis, Joubert syndrome, rhombencephalosynapsis, Chiari II malformation, ischemia, and tumors.
authors.affiliation: Department of Radiology, Seattle Children's Hospital, MA.7.220, 4800 Sand Point Way NE, Seattle, WA, 98105; Department of Radiology, University of Washington Medical Center, Box 357115, 1959 NE Pacific Street, Seattle, WA 98195-7117. Electronic address: teresa.chapman@seattlechildrens.org.
authors.forename: Teresa
authors.initials: T
authors.lastname: Chapman
authors.affiliation: Department of Radiology, University of Washington Medical Center, Box 357115, 1959 NE Pacific Street, Seattle, WA 98195-7117.
authors.forename: Sowmya
authors.initials: S
authors.lastname: Mahalingam
authors.affiliation: Department of Radiology, Seattle Children's Hospital, MA.7.220, 4800 Sand Point Way NE, Seattle, WA, 98105; Department of Radiology, University of Washington Medical Center, Box 357115, 1959 NE Pacific Street, Seattle, WA 98195-7117.
authors.forename: Gisele E
authors.initials: GE
authors.lastname: Ishak
authors.affiliation: Department of Radiology, Seattle Children's Hospital, MA.7.220, 4800 Sand Point Way NE, Seattle, WA, 98105; Department of Radiology, University of Washington Medical Center, Box 357115, 1959 NE Pacific Street, Seattle, WA 98195-7117.
authors.forename: Jason N
authors.initials: JN
authors.lastname: Nixon
authors.affiliation: Department of Pathology, Seattle Children's Hospital, PC.8.720, 4800 Sand Point Way NE, Seattle, WA, 98105.
authors.forename: Joseph
authors.initials: J
authors.lastname: Siebert
authors.affiliation: Department of Radiology, University of Washington Medical Center, Box 357115, 1959 NE Pacific Street, Seattle, WA 98195-7117.
authors.forename: Manjiri K
authors.initials: MK
authors.lastname: Dighe
mesh_terms: D001927:Brain Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D002531:Cerebellum / Q000000981:diagnostic imaging / Q000473:pathology; D003388:Cranial Fossa, Posterior / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging / Q000379:methods; D011296:Prenatal Diagnosis; D014463:Ultrasonography
keywords: Cerebellum; Congenital brain malformation; Posterior fossa; Prenatal imaging