[Peroneal nerve palsy induced by anterior tibialis pyomyositis]

A 16-year-old girl from Guadeloup developed paresis of the flexors of the right foot, associated with edema and acute pain located in the upper anterior tibialis muscle. Electromyography confirmed mononeuritis of the right peroneal nerve, with severe reduction of potential amplitude. Computed tomography of the right leg showed a heterogeneous mass involving the upper segment of the anterior tibialis muscle, close to the location of peroneal nerve. Muscle biopsy confirmed pyomyositis. Muscle culture was negative. Paresis improved soon after antibiotic therapy was started.