Tracheobronchomegaly, seen in Mounier-Kuhn syndrome, is an abnormal diffuse dilatation of the trachea and main bronchi.90-92 The diagnosis of tracheobronchomegaly is usually apparent on chest radiographs, CT, or MRI. Typically, there is protrusion of the mucosa through the trachealis muscle between the cartilaginous rings, producing a scalloped or corrugated appearance of the trachea and main bronchi (Figure 4-66). There is often an abrupt transition between the dilated lobar bronchi and normal segmental bronchi. patients with this disorder may have repeated respiratory infections leading to peripheral bronchiectasis.
figure 4-64 Chondrosarcoma of the trachea. A, Posteroanterior chest radiograph demonstrates a large mediastinal mass that deviates and partially obstructs the mid and distal trachea. B, Computed tomography scan through the midtrachea reveals a large soft tissue mass containing calcification that encircles and narrows the trachea, consistent with a chondrosarcoma arising from the trachea.
figure 4-65 Papillary carcinoma of the thyroid with laryngeal invasion. A, Lateral view of the neck shows a posterior supraglottic laryngeal-pharyngeal mass. B, Computed tomography section reveals a mass to the right and posterior to the larynx. There is destruction of the cricoid and thyroid cartilage on the right, with intraluminal tumor extension (asterisk).
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