<prompt> Neuroblastoma differs from Wilms tumor radiologically by all except -CalcificationAoa and IVC are not eroded but pushed asideSame locationIntraspinal extension of tumor  <response>: Ans. is c same location The following are the differentiting feature bw Neuroblastoma Wilms tumour. a Calcification There are foci of calcifications visible in neuroblastoma about 85 which are generally less common and less prominent in wilms tumour less than 15. b Intraspinal extention - Intraspinal extension is seen in neuroblastoma not in Wilms tumour. c Aoa IVC invasion - Wilms tumour invades Aoa and IVC. Where as Neuroblastoma does not invade these structures. d Location - Wilms tumour and neuroblastom can be differentiated on location too. C.T. findings will confirm the intrarenal location of Wilms. Where as Neuroblastoma will be seen above the kidney pushing it downwards outwards. e Crossing midline - Wilms tumors are typically confined to one side of the abdomen, whereas neuroblastomas usually cross the midline. Now what should be the answer? The options of this question are such that even if you know nothing about the topic, you will end up giving the correct answer. In the question they have asked about the factor differentiating Wilms tumour and Neuroblastoma and the option C is same location. How will two things differ on the basis of same location ? If you dont agree with my answer, dont worry; remember the difference bw the two tumours for any future question on the topic. 