Solid lung cancer is not necessarily invasive cancer, but the probability is higher.
Invasive lung cancer is the concept of pathomorphology. If it is in early stage, such as adenocarcinoma in situ, which does not break through the basement membrane under the microscope, in this case, it is non-invasive lung cancer, and once the lung cancer grows and breaks through the basement membrane, it is called invasive lung cancer.
However, on imaging, if the nodule is solid and there is a burr-like appearance around it, which is a kind of imaging sign of tumor invasion and infiltration to the periphery, then it suggests the possibility of invasive lung cancer. However, confirmation of invasive carcinoma requires postoperative pathology.
Thus, solid lung cancer may not always be invasive carcinoma, but the presence of this condition suggests a high possibility of invasive carcinoma.