<prompt> Lemon sign Banana sign are see in-Down syndromeSpina bifidaTurner syndromePeriventricular leukomalacia  <response>: Ans. is b i.e. Spina bifida Lemon and banana signs are ultrasonographic findings in a patient of neural tube defects esp spina bifida. The banana sign seen on axial imaging through the posterior fossa of fetus. It describes the way the cerebellum is wrapped tightly around the brain stem as a result of spinal cord tethering and downward migration of posterior fossa content. The cisterna magna gets obliterated and the shape of the cerebellum has the appearance of a banana. The sign persists into the second and third trimesters. 