Acute cerebellitis (AC) is an inflammatory syndrome characterized by acute onset of cerebellar signs/symptoms (such as ataxia, nystagmus or dysmetria) often accompanied by fever, nausea, headache, altered mental status and brain magnetic resonance imaging (MRI) abnormalities of the cerebellum 1) 2) 3).

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Amador N, Scheithauer BW, Giannini C, Raffel C. Acute cerebellitis presenting as tumor. Report of two cases. J Neurosurg 2007; 107(1)(Suppl)57–61.
3)
De Bruecker Y, Claus F, Demaerel P, et al. MRI findings in acute cerebellitis. Eur Radiol. 2004;14(8):1478–1483. doi: 10.1007/s00330-004-2247-y.