The difference between small pulmonary nodules and micronodules

　　The main differences between small and micro pulmonary nodules lie in size definition, malignancy risk, follow-up frequency, examination methods, and timing of intervention. The subsequent management plan should be determined based on specific nodule characteristics. If a nodule has irregular shape, lobulation, pleural traction, or similar features, timely medical evaluation and further examinations are recommended.

　　1. Size definition: Micro nodules refer to lung nodules with a diameter less than 5 mm, which are smaller in size; small nodules range from 5 to 10 mm in diameter, covering a broader size range. The two categories are clearly divided by the 5 mm threshold.

　　2. Malignancy risk: Micro nodules have an extremely low probability of being malignant and are often benign lesions such as inflammatory hyperplasia. Small nodules carry a relatively higher risk of malignancy, especially those approaching 10 mm, thus requiring closer monitoring.

　　3. Follow-up frequency: Micro nodules typically require annual follow-up to monitor changes. For small nodules, follow-up intervals depend on morphology and density, usually ranging from 3 to 6 months, with some cases requiring shorter intervals.

　　4. Examination methods: Initial detection of micro nodules relies on chest CT, with low-dose CT used for subsequent follow-up. Small nodules may require enhanced CT, thin-slice scanning, and, when necessary, tumor marker tests to assist in assessment.

　　5. Timing of intervention: Micro nodules generally do not require immediate intervention and only need long-term surveillance. However, if small nodules show abnormal morphology or signs of growth, further evaluation is needed promptly, and interventions such as biopsy or surgical treatment may be required.

　　In daily life, maintain regular作息 (sleep patterns), quit smoking and avoid secondhand smoke and dusty environments to reduce lung irritation. Eat a balanced diet rich in vitamins and protein to boost immunity. Follow medical advice for regular check-ups, avoiding both excessive anxiety and neglecting follow-up appointments, to manage lung health scientifically.