The pulmonary nodule is a spot with round or oval shape that occurs in the lungs and is detected by a CT scan or a chest X-ray. In most cases, the appearance of the lung nodule is not cancerous. Among the causes of their appearance may be scars and past infections. Their morphology is small, with a smooth edge and solid appearance and uniform. In the case of malignant, lung cancer is one of the major diseases that develop. Normally, the pulmonary nodules usually have symptoms. If the patient is a smoker, have symptoms of lung cancer themselves or nodule has grown or changed in appearance, your specialist may want to do a biopsy to rule out cancer.