An Unusual Case of Wernicke's Encephalopathy in a Child.

Wernicke's encephalopathy (WE) is a manifestation of thiamine deficiency. The majority of affected patients are alcoholics and are adults. Often, clinicians fail to recognize that WE can also be found in non-alcoholic patients at risk for thiamine deficiency. Sometimes patients may not present with all the classic features, or the individual clinical signs may be treated as single problems and not a constellation of signs that form a diagnosis of WE. We present a unique case of a four-year-old male with a past medical history of food aversion who presented with intractable vomiting and weakness. The patient's clinical features showed signs of severe dehydration and weight loss. His clinical state subsequently progressed to having ophthalmoplegia and gait ataxia. Brain MRI demonstrated mamillary body changes, and serum thiamine level was significantly below the normal limit. Based on the patient's clinical assessment, deficient serum thiamine, and MRI findings, WE was diagnosed. The patient was evaluated by Pediatric Neurology and started on treatment with high dose IV thiamine. He showed an excellent response to thiamine treatment and had a significant resolution in his symptoms before discharge.