Sun, a 65-year-old man, underwent a medical checkup a year ago where a nodule was discovered in his right lung. The doctor recommended further testing, but Sun declined.
The doctor then advised regular follow-ups to monitor the nodule's progression. However, Sun felt no discomfort and paid no attention to the matter.
One year later.Sun developed symptoms including coughing and coughing up blood. Hospital tests revealed the lung nodule had progressed to lung cancer. Lung cancer is a dreaded diagnosis, and many people become extremely anxious upon discovering a lung nodule, fearing they are on the brink of lung cancer. But is this really the case?
Are lung nodules precancerous lesions?
Not all lung nodules are precancerous. Nodules can be benign or malignant. Among known nodules, 70-80% are benign, while approximately 20-30% are potentially pathological. Therefore, not all lung nodules require surgical removal.
Generally, there are three possibilities when a lung nodule is detected: it has developed into lung cancer, it is not cancer but has the potential to become cancerous, or it is unrelated to cancer. How can we determine if a lung nodule has the potential to become cancerous?
Based on nodule density, lung nodules can be classified into three types: ground-glass nodules, mixed nodules, and solid nodules.
1. Solid Nodules
These appear as entirely high-density shadows, showing up white on CT scans. Small, smooth, and round solid nodules are often benign. However, partially solid nodules carry a higher risk of malignancy, frequently developing into lung adenocarcinoma, typically originating from small nodules.
2. Ground-Glass Nodules
Pure ground-glass nodules are generally less than 1 cm in size with well-defined borders, typically indicating benignity. Caution is warranted, however, as ground-glass nodules carry a higher risk of malignancy and are more commonly observed in males.
3. Mixed Nodules
As the name suggests, mixed nodules combine features of both ground-glass and solid nodules. Their malignant rate exceeds 60%. Malignant nodules exhibit lobulation, spiculation, central cavitation, and may involve pleural traction or invade surrounding healthy lung tissue.They rapidly grow by absorbing nutrients from surrounding tissues, arguably making them the "most dangerous" type of nodule.
How can nodules be detected?
Chest CT is currently recognized as the most sensitive imaging method for detecting pulmonary lesions. Advances in chest imaging technology now allow high-resolution CT to clearly screen for minute changes within the lungs that were previously difficult to detect with X-rays or thick-slice CT.
However, not everyone requires annual routine CT scans. Individuals over 45 years old, long-term smokers, those with a family history of lung cancer, and people chronically exposed to air pollution—such as traffic police officers and coal miners—are advised to undergo annual CT screening.
Regarding nodules, there is no need for excessive worry, as most are benign. If a nodule is suspected to be malignant, follow your doctor's guidance for further testing. If malignancy is confirmed, surgical removal is the appropriate course of action. Benign nodules typically only require regular follow-up monitoring.