Unusual cause of an abduction deficit in a 14 year old girl

Answers on p 799. A 14 year old girl presented with sudden onset of diplopia and slurred speech with no fever. A week previously, she had a headache, cough, and rhinorrhoea. However her symptoms resolved a few days before admission. Eye examination confirmed an abduction paresis of the left eye and abduction nystagmus of the right eye. Esotropia of the left eye was absent when the eyes were fixated …