**2.2 Acute cerebellar ataxia**

Acute cerebellar ataxia is the most common cause of acute ataxia in children accounting for nearly 30–50% of all cases [9]. It is a benign and self-limiting syndrome, usually a postinfectious phenomenon. It usually occurs in children between the ages of 3 and 5, but it can be seen in older children [9, 15]. The main clinical manifestation is sudden onset of unsteadiness of gait associated with cerebellar signs, nystagmus is reported in nearly 50% of patients [15]. Ataxia usually starts 1–3 weeks following a viral infection. Different viral agents have been linked to its development; the most common virus associated is varicella (25%) and it can occur in association with vaccines [12]. It has a benign prognosis with spontaneous recovery in most cases, the average duration of cerebellar signs is about 8 weeks [15].
