Thoracic infection by anaerobes are uncommon diseases and often presen
ts difficulty in diagnosis. We report a case of thoracic infection due
to Fusobacterium Nucleatum. A 60-year old man presented a lesion infi
ltrating from the lung to the thoracic wall. Fusobacterium Nucleatum w
as isolated on pus collected. Treatment by penicillin, metronidazole c
ombined with surgical drainage was highly effective.