Vermian hypoplasia

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This anomaly is similar to Blake’s pouch cyst but for the hypoplasia of the vermis that is small and dysmorphic. It was once referred to as ‘Dandy-Walker variant’ and is frequently associated with other anomalies

Reference(s):Pilu G, Segata M, Ghi T, Carletti A, Perolo A, Santini D, Bonasoni P, Tani G, Rizzo N. Diagnosis of midline anomalies of the fetal brain with the three-dimensional median view. Ultrasound Obstet Gynecol 2006;27(5):522–9. PubMed PMID: 16586477. Guibaud L, des Portes V. Plea for an anatomical approach to abnormalities of the posterior fossa in prenatal diagnosis. Ultrasound Obstet Gynecol 2006;27(5):477–81. PubMed PMID: 16619384. Paladini D, Volpe P. Posterior fossa and vermian morphometry in the characterization of fetal cerebellar abnormalities: a prospective three-dimensional ultrasound study. Ultrasound Obstet Gynecol 2006;27(5):482–9. PubMed PMID: 16619375. Pilu G, Visentin A, Valeri B. The Dandy-Walker complex and fetal sonography. Ultrasound Obstet Gynecol 2000;16(2):115–7. Review. PubMed PMID: 11117078.