Left lung nodule 26mm refers to a localized round-like soft tissue lesion surrounded by air-containing lung tissue in the left lung, which is 26mm in diameter, as found in chest CT examination. 1. Lung nodule is a local round soft tissue lesion: lung inflammation, tuberculosis, tumors and other diseases can form local soft tissue foci in the lungs, and the CT imaging shows a focal, round, increased density shadow. 2. 26mm in diameter of the lesion is more likely to be malignant: it is reported that the probability of malignancy of lung nodules with a diameter of more than 20mm is more than 64%. 3. 26mm left lung nodule is generally recommended for surgical treatment, whether the operation needs further examination by the clinician to determine. Left lung nodule 26mm malignant probability is high, it is recommended to go to the hospital as soon as possible for further diagnosis and treatment, so as not to delay the condition.