<prompt> Opsomyoclonus is encountered as CF of-MeningiomaNeuroblastomaNeurofibromatosisExcision  <response>: 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. 