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Today DNM most commonly arises from pharyngeal foci and mixed polymicrobial aerobic and anaerobic infections. Reduced tissue oxygenation and impaired immune function promotes its development. Most cases of DNM are limited to the upper mediastinum and can be adequately drained by a transcervical approach. Formal thoracotomy should be reserved for cases extending below the plane of the tracheal bifurcation. Although DNM remains an aggressive infection with high morbidity, a favorable outcome can now be obtained in 85% of patients, even with this selective approach. Early diagnosis and surgical intervention are crucial.

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