title: Actinobacillus actinomycetemcomitans causing a mediastinal abscess.
mesh_terms: D000038:Abscess / Q000209:etiology*; D000189:Actinobacillus Infections; D006801:Humans; D008297:Male; D008477:Mediastinal Diseases / Q000209:etiology*; D008875:Middle Aged