<prompt> Banana sign seen in the fetal brain suggestsRenal agenesisEncephaloceleSpinabifidaPorencephaly  <response>: C Spina bifida Spina Bifida: Spinal dysraphism, spinabifida, is the incomplete closure of the neural tube. It may be Spina bifida aperta, Spina bifida Cystica, or Spina bifida occulta. Spina bifida Cystica is associated with 90 neurological defects --- 1. Simple Meningocele, 2. Myelocele, 3. Myelomeningocele, 4. Myeloschisis. Myelomeningocele is associated with 1. Hydrocephalus 70-90, 2. Chiari II malformation 100, 3. Congenitalacquired kyphoscoliosis 90 4. Vertebral anomalies, 5. Diastematomyelia, 6. Duplication of central canal, 7. Hemimyelocele, 8. Hydromyelia 9. Chromosomal anomalies trisomy 18, 13, triploidy. Ultrasonography of cranium in Spina bifida myelomeningocele shows: Banana Sign: Obliteration ofcisterna magna with cerebellum wrapped around posterior brainstem secondary to downward traction of spinal cord in Arnold Chiari malformation type II in 96 of fetuses 24 weeks. Lemon Sign: concavelinear frontal contour abnormality located at coronal suture associated with nonskin covered myelomeningocele in 98 of fetuses 24 weeks 13 of fetuses 24 weeks Other features include -- nonvisualisation of cerebellum, effaced cysterna magna 100 sensitivity, ventriculomegaly etc. 