<prompt> Banana and lemon sign is seen in which fetal anomalies?Neural tube defectHydrops fetalisTwinsIUD  <response>: Ans. is a, i.e. Neural tube defectRef. Williams Obs. 23e, p 354, 355Signs of Spina bifida on UltrasoundSmall biparietal diameter.Ventriculomegaly.Frontal bone scalloping or the so called lemon sign.Elongation and downward displacement of the cerebellum-the so called banana sign.Effacement or obliteration of the cisterna magna. 