A<unk>  or pulmonary<unk>  is a relatively small focal density in the<unk> . A solitary pulmonary<unk>  (SPN) or coin lesion, is a mass in the<unk>  smaller than three centimeters in diameter. A pulmonary micronodule has a diameter of less than three millimetres. There may also be multiple<unk> s. One or more<unk> s can be an incidental finding found in up to 0.2% of chest X-rays and around 1% of CT scans. The<unk>  most commonly represents a benign tumor such as a granuloma or hamartoma, but in around 20% of cases it represents a malignant cancer, especially in older adults and smokers. Conversely, 10 to 20% of patients with<unk>  cancer are diagnosed in this way. If the patient has a history of smoking or the<unk>  is growing, the possibility of cancer may need to be excluded through further radiological studies and interventions, possibly including surgical resection. The prognosis depends on the underlying condition.
Lung nodule
Lung abscess
Pulmonary consolidation
Lung tumor
Pleural disease
Mediastinal tumors
Pulmonary infiltrate
Malignant pleural effusion