Air bronchogram on chest Xray denotes: (A) Intrapulmonary lesion, (B) Extrapulmonary lesion, (C) Intrathoracic lesion, (D) Extrathoracic lesion
Answer is A. 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.