Most benign tumors in the lung do not require surgery in most cases. Benign tumors in the lung rarely develop into malignant, and most benign tumors are stable for a long time, even without proliferation, and are not too harmful to the body, so there is usually no need to go for surgery either. There are of course many types of benign tumors, including inflammatory pseudotumors, malignant tumors, and granulomatous changes. In addition, there are also fungal changes such as post-organic lung abscesses, tuberculosis spheres, sclerosing hemangiomas, and fungal changes. Precancerous lesions, such as atypical adenomatous hyperplasia, are those that have malignant potential but have not yet developed into malignancy, and can be considered benign tumors. Here there are some cases to be treated differently, such as inflammatory pseudotumors, small non-growing inflammatory pseudotumors that do not move are fine, but they have grown larger and have recently shown active growth, although they are benign, it is still recommended to remove them. If a precancerous lesion is atypical adenomatous hyperplasia, if it can be pathologically diagnosed as such, it can still be surgically removed. In the vast majority of cases, it is difficult to determine whether it is benign or malignant. If it is clear through puncture that it is benign, and if it is like a benign tumor that is relatively mild, it can be left alone.