This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Opsomyoclonus is encountered as C/F of- 
Select and explain. 
A. Meningioma, B. Neuroblastoma, C. Neurofibromatosis, D. Excision
B: Neuroblastoma
Answer: B: Neuroblastoma 
Explanation: Ans. is 'b' i.e., Neuroblastoma o Neuroblastoma can present as paraneoplastic syndrome of autoimune origin manifesting as ataxia or oposmyoclonus (Dancing eyes and dancing feat). o In such cases primary tumor is in the chest or abdomen and the brain is negative for tumor. o Some tumor produce catecholamines that can cause sweating and HTN and some release vasoactive intestinal peptide (VIP) causing secretary diarrhea.