Air bronchogram on chest Xray denotes
A solitary pulmonary nodule (SPN) or coin lesion is a mass in the lung smaller than 3 centimeters in diameter.
It can be an incidental finding found in up to 0.2% of chest X-rays and around 1% of CT scans.
Intrapulmonary lesion
Extrapulmonary lesion
Intrathoracic lesion
Extrathoracic lesion