Arnold chiari II malformation is a congenital CNS abnormality characterised by downward displacement of posterior fossa structures into spinal canal. This malformation is a causative factor of death in neonates and infants. A thorough understanding of the direct and indirect sonographic findings is necessary for the diagnosis of chiari II malformation in developing fetus.
Key words: Arnold chiari II malformation, sonography, banana sign, lemon sign,
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