Two cases of herniation of the lung in the cervical region, immediately posterior to the clavicle, observed within the past year, seem worthy of reporting, not only on account of the rarity of the condition, but more especially because of the roentgen findings. Second in frequency of the three types of lung hernia, this type accounts for 20 to 28 per cent of a total of some 200 cases appearing in the literature (1, 2, 3). The site most commonly affected is the thoracic or intercostal region, the number of such cases amounting to nearly 72 to 80 per cent, while only one case has been recorded (in 1882) of herniation through the diaphragm (4). Hernia of the lung occurs more frequently in males than in females, the ratio, based on conservative estimates, being three to one (1). The patients are usually over 45 or under 15 years of age, only 31 per cent of the cases occurring between those ages. The prognosis is good. Surgery is the most effective procedure, combined with treatment of the underlying condition and change of occupation if necessary. Etiologically lung hernias are classified as congenital or acquired (2). The latter include those occurring spontaneously, as a result of trauma, or as the result of a pathologic condition of the thoracic wall. Spontaneous hernias, which constitute about 33 per cent of the acquired type (1), appear to be associated with weakness of the chest wall plus increased intrathoracic pressure and may develop after a long-continued cough, after constant blowing as in playing a wind instrument or in glass blowing, after undue exertion such as lifting a heavy object, after straining at stool, or after labor. In a sense, this type is due to a combination of congenital and spontaneous factors. Van Wezel's (5) recent report of cervical hernia occurring in a 39-year-old male who had had a cough for several winters, associated with a progressive bronchitis, is an example of the dual role of congenital and spontaneous causes. The author attributed the hernia to deficiency in the vertebropleural ligament, that is, Sibson's fascia. The pathologic and the spontaneous types also overlap. Among the pathologic causes, in addition to bronchitis, as in Van WezeI's case, are chronic bronchiectasis and whooping cough. Congenital absence of muscles may be responsible for the condition in individuals subjected to undue increase in air pressure within the lungs. Hernia in the cervical area usually occurs between the scalenus anticus and sternomastoid muscles. A tendency toward protrusion in this area is controlled by the parietal pleura, the neck muscles, and the cervical fascia. Weakness or deficiency of any of these factors predisposes to hernia. The outstanding symptom is the occurrence of a mass, which appears with the Valsalva maneuver and abates with inspiration. Rarely is it painful (3, 5), although Montgomery and Lutz (1) found that local pain and cough develop insidiously.