Tracheobronchial tree
Maximal diameter
<3 cm
Radiography (Posteroanterior)
X-ray computed tomography
A diameter of more than 3 cm is highly suggestive of Mounier-Kuhn syndrome (tracheobronchomegaly).This measurement is usually taken 2 cm above the aortic arch.
The main bronchi should also be measured in order to make this diagnosis.
Kwong JS, Müller NL, Miller RR. Diseases of the trachea and main-stem bronchi: correlation of CT with pathologic findings. Radiographics. 1992;12 (4): 645-57.
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