Neuroblastoma differs from Wilm's tumor radiologically by all except -
Ans. is 'c' same location The following are the differentiting feature b/w Neuroblastoma & Wilm's tumour. a) Calcification There are foci of calcifications visible in neuroblastoma (about 85%) which are generally less common and less prominent in wilm's tumour (less than 15%). b) Intraspinal extention - Intraspinal extension is seen in neuroblastoma not in Wilm's tumour. c) Aoa & IVC invasion - Wilm's tumour invades Aoa and IVC. Where as Neuroblastoma does not invade these structures. d) Location - Wilm's tumour and neuroblastom can be differentiated on location too. C.T. findings will confirm the intrarenal location of Wilm's. Where as Neuroblastoma will be seen above the kidney pushing it downwards & outwards. e) Crossing midline - Wilm's 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 Wilm's tumour and Neuroblastoma and the option 'C' is same location. How will two things differ on the basis of same location ? If you don't agree with my answer, don't worry; remember the difference b/w the two tumours for any future question on the topic.
Calcification
Aoa and IVC are not eroded but pushed aside
Same location
Intraspinal extension of tumor