My best friend has a round of pneumonia and they found a cyst about 5 cm in his lung. they said cyst . he is 65 could it be a tumor?

Mgt: The cyst may represent an area of infection. A follow up study should be performed. If he is a smoker, has a history of smoking in the past, and/or produces sputum, he should have sputum cytologies sent by your PCP. If there is no recent TB test, this can be performed at the same time. A virtual appointment is available online and the radiograph can be uploaded.