Acute cerebellitis with hydrocephalus.

We report a case of an 8 years old child who presented with sudden onset of headache and vomiting. He had broad-based gait and intention tremors on admission. MRI brain revealed isointense signals on T1-weighted imaging and hyperintense signals on T2-weighted imaging. Cerebellar swelling was also identified with significant mass effect obliterating the fourth ventricle. CT head showed prominent third and lateral ventricles. He was treated with high dose corticosteroids and required an external ventricular drain (EVD) insertion. He made an uneventful recovery and suffered no neurologic deficit. The clinical and radiologic findings in this boy were consistent with cerebellitis complicated by hydrocephalus.