Introduction:

The clinical manifestations of Guillain Barré syndrome and acute viral myositis are different. Both conditions are usually self-limiting and can manifest after an infectious process.

Objective:

To report an unusual presentation of two conditions in the same patient.

Case presentation:

A 4-year-old girl presented with symptoms of acute viral myositis, which, with improvement, made more evident the characteristic symptoms of Guillain Barré syndrome. The case was confirmed through hematological studies, cerebrospinal fluid cytology and neurophysiological studies. The patient was treated with intravenous human immunoglobulin G for 5 days, after which she showed improvement of the neurological symptoms.

Conclusions:

The involvement of the muscle and the peripheral nervous system may coexist in the pediatric population, but it is not a usual condition, so more research is needed to better describe this entity and its prognosis.

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