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KMID : 0386119920280010084
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Journal of the Korean Radiological Society
1992 Volume.28 No. 1 p.84 ~ p.87
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Differential Diagnosis Between Traction and Compression of Trachea
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변재영
박석희/안명임/김종우/박용휘
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Abstract
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The trachea is a cartilagenous and membranous tubular midline structure with parallel walls. Tracheal deviation may be caused either by traction toward the diseased hemithorax or by compression toward the normal side. Unless an obvious mass is
observed
radiographically, occasionally it can be difficult to decide whether the trachea has been pushed or pulled from its normal position in the mediastinum. We studied the differences between tracheal deviation patterns in 23 patients with
fibroatelectatic
pulmonary tuberculosis and 35 patients with elongated and dilated aortas.
In cases of retraction of the trachea by fibroatelectatic pulmonary tuberculosis, the diameter of the deviated segment was greater than that of the normal segment and deviation of the wall adjacent to the fibroatelectasis from its normal position
was
greater than that of the opposite wall. In cases of compression of the trachea by the elongated and dilated aorta, the diameter of the diviated segment was smaller than that of the normal segment and deviation of the wall adjacent to the aortic
arch
from its normal position was greater than that of the opposite wall.
We conclude that these differences between tracheal deviation patterns are useful signs for discriminating retraction from compression. Thus when the trachea is retracted, the deviation of the juxtalesional wall is greater than that of the
lesion-free
wall, and vice versa.
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