A solid nodule is not necessarily cancer. Usually, when solid nodules are found in CT, MRI or chest X-ray, some patients get nervous and think they have cancer. In fact, the so-called solid nodules are only an imaging finding, and many benign lesions, other than malignant tumors, can also appear as solid nodules, for example, pulmonary tuberculosis can appear as solid nodules in lung tissue; hepatic hemangioma can also appear as solid nodules on liver CT, etc. To distinguish between benign and malignant nodules, other imaging features of the nodules and other tests should be taken into account. For example, benign solid nodules are generally regular in shape, slow in growth, clearly demarcated from surrounding tissues or even visible as an envelope, and generally do not enhance on enhanced scans. In contrast, malignant solid nodules are generally irregular in shape, have burrs on the edges, are not clearly demarcated from surrounding tissues, and grow more rapidly, and enhancement scans generally show uneven enhancement, and some may even reveal enlargement of surrounding lymph nodes. Of course, the most accurate way to distinguish whether a solid nodule is benign or malignant is to perform a biopsy.