Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Bronchogenic cysts originate from the ventral foregut that forms the respiratory system. They are located close to the trachea or main stem bronchi.
Histology of bronchogenic cyst
Bronchogenic cysts may be unilocular (figure 1) or multilocular. They may be located in the dermis or subcutis and occasionally drain into the overlying epidermis via a sinus. They are often filled with thick mucinous material and debris (figure 2).
The lining of the cyst is typically ciliated (figure 3, arrows) and may be columnar or cuboidal. Squamousmetaplasia is common. In the wall, it is very common to find smooth muscle and respiratory-type mucous glands (figure 4). Cartilage is another common finding in the wall.