Aim: To show that conversion reactions should be suspected when symptomatology or instrumental checking does not conform to a precise pathological pattern in its anatomical and physiological keys.
Methods: We report the case of a 14-y-old girl who presented with signs and symptoms of Guillain-Barré polyradiculonevritis. Negative instrumental and laboratory tests led us to consider a possible diagnosis of conversion reaction.
Results: After a more detailed history emphasizing the close bond between the patient and her father, a poor peer-relation exchange and psychological stress, we were able to identify conversion reactions through the patient's motor signs.
Conclusion: Conversion symptoms must be suspected and searched for when the neurologic outline is difficult to clarify, and also in the case of Guillain-Barré syndrome that does not respond to plasmapheresis.