In recent years there has been an increased interest in pulmonary adenomatosis. Swan (2), in a recent article, has ably reviewed the extensive literature. The questions as to whether or not the lesions represent true neoplasms, from what tissue they originate, and their etiology, are still unsolved and controversial. It is our intention to report two cases, analyze the radiologic picture, and discuss briefly the diagnosis of this condition. Case Reports Case A 31-year-old Filipino male was admitted to Fitzsimons Army Hospital on Aug. 16. His history dated back to April when he began to experience left-sided chest pain and left shoulder pain associated with weakness of the left arm. He consulted a private physician, who made a diagnosis of pulmonary tuberculosis and recommended hospitalization. The patient was then inducted into the Army and, because of the complaints previously described, was admitted to a station hospital on June 22, where a diagnosis of pulmonary tuberculosis and tuberculosis of the. 6th cervical vertebra was made. At the time of admission to Fitzsimons Army Hospital, in August, positive findings consisted of induration and adenopathy of the left posterior cervical nodes, together with râles generalized throughout all lung fields. Sputum smears for acid-fast bacilli were negative, as were all other laboratory studies. X-ray examination revealed a generalized nodular pulmonary infiltrate throughout all lung fields (Fig. 1). The nodules varied from 0.3 to 1.5 cm. in diameter. Their margins were hazy, and in some areas they showed a tendency to become confluent. There was a destructive process of the 6th and 7th cervical vertebrae (Fig. 2). The trachea was deviated to the right by a cervical mass. The hospital course was progressively downhill. On Sept. 28 a posterior cervical node was removed and microscopic examination showed metastatic adenocarcinoma. Weakness and cachexia became progressive and the patient died on Nov. 6. Autopsy was performed eleven hours after death. Gross examination showed the pleural cavities to be free of fluid and of adhesions. The right lung weighed 840 gm., the left 755 gm. The pleurae were thin, transparent, and glistening. The general consistency of the lungs was firm, with almost complete loss of normal crepitation. The parenchyma was replaced by discrete and confluent tumor nodules. The cut surfaces showed multiple tumor foci from 0.3 cm. to 1.5 cm. in diameter, which were yellowish pink, usually discrete, and somewhat slimy, with intervening dark red lung tissue. Numerous tumor nodules encroached upon the pleura. The bronchi were traced in so far as possible with fine dissection, and in only one terminal bronchiole, 0.3 cm. in circumference, in the left lower lobe was there evidence of tumor invasion in the form of thickening and roughened nodules. This was adjacent to a larger focus, 2.5 cm., in the periphery of the lung. The vessels showed no abnormalities.