MEDIASTINITIS



Acute mediastinitis is usually due to esopha­geal perforation or to traumatic rupture of the air­way, or rarely to spread of infection from the neck or abdomen. Features are usually typical of me­diastinal disease, along with fever, leukocytosis, pneumomediastinum, pneumothorax, and often a pleural effusion. Distinctive features include a high pleural fluid amylase with esophageal per­foration and fracture of the first three ribs seen with bronchial rupture. Treatment includes an­tibiotics, surgical drainage, and closure of the per­forated viscus.

Chronic mediastinitis is usually caused by a granulomatous process, most often histoplasmo­sis, and less frequently by other fungal infections, tuberculosis, and syphilis. Noninfectious causes include sarcoidosis and, in the past, the use of methysergide. An idiopathic cause should be con­sidered only when specific disorders are ruled out. Treatment other than that specifically di­rected at the underlying disorder, such as surgery, is usually unsuccessful.