A 5 year old child is admitted with headache, vomiting and difficulty in walking. Physical findings include truncal ataxia, papilloedema and left lateral rectus palsy. No finger-to-nose ataxia could be detected on the left side or right side. The most likely diagnosis is –
Congenital lesions would present Hydrocephalus since birth (for a & c)
Dandy walker syndrome
Syringobulbia
Arnold-chiari malformation
Medulloblastoma