Infections in man by Actinomyces bovis usually have involved the cervicofacial, abdominal, or thoracic organs. The first two of these occur more frequently, pulmonary actinomycosis being noted in only about 15% of all clinically reported cases. The fungus is an endogenous organism of the mouth and gastrointestinal tract. Therefore, it may be a cause of disease in any portion of the United States or the world. It is more often seen, however, in certain rural sectors where either the external environment may be more frequently contaminated by the fungus or more likely where oral hygiene is poor. The need for recognition of all forms of the infection has taken on additional interest, since pulmonary involvement may be mistaken for carcinoma of the lung and because current therapies with various antibiotics, although frequently of prolonged duration, are now curative. It was thought, therefore, worth while to review the roentgenographic findings of
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