Frosted glass nodules with clear margins are more likely to be benign, and those with fuzzy margins have a higher risk of malignancy. Pulmonary nodules are dense shadows in the lungs ≤3 cm detected on chest CT, which may result from benign conditions such as misshapen tumors and pneumonia, or from malignant tumors such as bronchopulmonary carcinoma. Characteristics of nodules such as density, size, and margins can be used to assess the risk of malignancy. Nodules can be categorized into solid and ground-glass nodules based on their density, with mixed ground-glass nodules having a higher risk of malignancy than solid nodules, and solid nodules having a higher risk than pure ground-glass nodules. Nodule margins can be classified as clear or fuzzy. Generally, benign diseases have clear margins, while malignant tumors are invasive and invade surrounding tissues leading to fuzzy margins; therefore, generally, fuzzy margins are associated with a higher risk of malignancy than clear margins. Lung nodules are also evaluated based on the size and shape of the nodule, as well as the individual’s age, gender, history of emphysema, family history of lung cancer, and smoking history. Patients are advised to consult a specialist for a thorough evaluation of the nodules based on multiple factors.