This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in Obstetrics, Subject name: Gynaecology & Obstetrics
Banana and lemon sign is seen in which fetal anomalies? 
Select and explain. 
A. Neural tube defect, B. Hydrops fetalis, C. Twins, D. IUD
A: Neural tube defect
Answer: A: Neural tube defect 
Explanation: Ans. is a, i.e. Neural tube defectRef. Williams Obs. 23/e, 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.