The concept of pulmonary shadowing is relatively general in clinical practice. A high-density shadow appears on chest X-ray in an area of normal lung tissue and appears as a mass or nodule on a chest radiograph or CT. The cause of a lung shadow can be either inflammation of the lung, tuberculosis, small nodules or lung cancer.
If the lung shadows are small, they can be monitored dynamically on medical advice. Most pulmonary shadows can be diagnosed after careful examination. For patients with lung shadows, it is important to further define the cause to ensure timely treatment and avoid delaying the disease.