What does lung nodule shadow mean? Is it serious?

Lung nodule shadow is an imaging description, usually refers to the subject's lung imaging examination has a diameter of less than 3 cm nodular shadow. Lung nodule shadow may be very serious. Lung nodule shadow

may be tuberculosis, pneumonia and other diseases caused by benign lesions, it may also be lung adenocarcinoma, small cell lung cancer and other malignant diseases caused. Generally, the diameter of lung nodule shadow is relatively small, patients without discomfort symptoms, the condition is relatively mild. However, if the patient's lung nodule shadow rapidly increases, it is more considered to be related to lung cancer, this situation is more serious.