Thoracic actinomycosis presenting as a brachial plexus syndrome.

Thoracic actinomycosis is a well described entity. The clinical spectrum is broad, ranging from the asymptomatic patient with an abnormality on chest radiography to the chronically ill patient with fever, weight loss, and skin lesions from sinus tracts draining a lung abscess. Here we report a more unusual presentation, a patient with a chest wall lesion and right handed weakness found to be secondary to a brachial plexus lesion induced by actinomycosis.