Are small nodules in the lungs lung cancer? With the popularity of chest CT and advances in surgical techniques, combined with international research reports, we have found that only a small percentage of small lung nodules are early stage lung cancer or precancerous lesions. What is a solid nodule in the lung? Is the lower the nodule density, the better? The lung itself is a gas-containing organ, and a solid lung nodule is a nodule that does not contain gas (not air bubbles). As for whether the lower the nodule density, the better? Actually, if the nodule density is very high, like a stone showing calcification, it is more likely to be a benign nodule. However, if the nodule density is very low, and at the lowest it may be completely gas inside, then it may be a pulmonary alveolus or a pulmonary nodular cavity, and of course a tumor cannot be excluded. A portion of solid nodules in the lungs are not very dense nor very low, and this is when various possibilities need to be ruled out to diagnose the disease. What is a ground glass nodule in the lung? Are they more likely to become malignant? A pulmonary ground glass nodule is a homogeneous air-containing nodule that originates in the lung. The lesion will grow along the alveoli and does not destroy the alveolar architecture. However, it is denser than normal lung tissue and appears as a ground glass shadow on CT images. Most typical ground glass nodules are precancerous or early stage lung cancer, but this needs to be analyzed by clinicians on a case-by-case basis. What does it mean when the lung nodules are suspected to be atypical adenomatous hyperplasia? Is atypical adenomatous hyperplasia lung cancer? Tumors do not occur suddenly, but gradually evolve from normal cells to cancer cells, and the same is true for lung cancer. In this process, there are some cells that do not meet the morphological criteria of lung adenocarcinoma cells but are not normal cells, showing an abnormal cellular reaction and proliferation, which is called atypical adenomatous hyperplasia. This atypical adenomatous hyperplasia is a typical ground glass nodule in the lung and is a precancerous lesion. Generally, it does not heal on its own, but it can be completely cured if treated promptly; if left untreated, these atypical adenomatous hyperplasia may slowly progress to adenocarcinoma of the lung. Is the larger the lung nodule, the more likely it is to be cancerous? Is a nodule >8 mm malignant? Theoretically, the larger the lung nodule, the higher the probability of cancer, but it is not absolute. Our hospital once did tumor lesion determination for patients over 70 years old and found that lung nodules over 3 cm and age over 70 years old are basically diagnosed as lung cancer. Of course, whether a nodule is malignant or not depends crucially on the imaging characteristics of the nodule and secondly on the size. In addition, not all lung nodules require treatment. If the nodule is benign and very small, there is no need for treatment; however, if the lung nodule is larger than 8 mm and is a ground glass nodule, it requires treatment and may require surgical intervention if necessary. What are small calcified lung nodules? Are they all benign? Calcified pulmonary nodules mean that the lesion has become fibrotic and has lost its original cellular components and lung structure. Generally, calcified lung nodules are benign, but in rare cases, these small lung nodules contain scattered irregular calcifications, which may be a case of adenocarcinoma of the lung. What are multiple lung nodules? Is it a precursor of lung cancer? With the emphasis on diseases nowadays, it is very common to find lung nodules, especially multiple lung nodules, on chest CT. However, multiple lung nodules do not mean that they are precursors of cancer. Foreign lung cancer screening has found that multiple lung nodules occur in the lungs of normal people as well, and only nearly 5% of small nodules may be malignant. Therefore, there is no need for people to be overly nervous when multiple lung nodules are found. Is it possible to get lung cancer if small lung nodules are found but there are no symptoms? The diameter of small lung nodules is less than 2 cm, and its volume occupies a very small proportion of the whole lung, which usually does not cause symptoms in patients. In addition, many patients find small nodules in the lung and experience symptoms such as coughing and coughing up phlegm, thinking that they are caused by small nodules in the lung. In fact, this is a misconception because only the bronchial tubes are affected to cause symptoms such as coughing and coughing, while small nodules in the lungs are small and usually do not affect the bronchial tubes. Therefore, the presence of symptoms such as cough and sputum is generally unrelated to small lung nodules. In this way, it is not a bad thing for a patient to find a small nodule in the lung without any symptoms during a physical examination, because it indicates that the nodule is relatively small and less harmful to the body. However, it is still necessary to seek medical attention at this time so that the doctor can determine whether treatment or regular review is needed.