What are the manifestation symptoms of lung cancer in CT examination during treatment? Symptoms of lung cancer Cough. Cough is the most common symptom, and cough as the first symptom accounts for 35% to 75% of patients. The cough caused by lung cancer may be related to the alteration of bronchial mucus secretion, obstructive pneumonia, pleural invasion, pulmonary atelectasis and other intrathoracic comorbidities. When the tumor grows in the bronchial mucosa above the segment with larger diameter and sensitive to foreign stimulation, it can produce cough caused by foreign body-like irritation, typically manifesting as paroxysmal irritating dry cough, which is often not easily controlled by general cough suppressants. When the tumor grows in the smaller bronchial mucosa below the segment, the cough is not obvious, or even no cough. For patients who smoke or suffer from chronic bronchitis, if the degree of coughing is aggravated, the frequency of coughing is increased, and the nature of coughing changes such as a high-pitched metallic sound, especially in the elderly, they should be highly alert to the possibility of lung cancer. Blood in the sputum or hemoptysis. Blood in sputum or hemoptysis is also a common symptom of lung cancer, and about 30% of the patients have this as the first symptom. Due to the rich blood supply and brittle texture of tumor tissue, blood vessels may rupture and cause bleeding during severe coughing, and coughing up blood may also be caused by local necrosis or vasculitis. Coughing up blood in lung cancer is characterized by intermittent or persistent, repeated small amounts of blood in sputum, or small amounts of hemoptysis. Occasionally, large blood vessels rupture, large cavity formation or tumor rupture into the bronchi and pulmonary vessels, resulting in uncontrollable hemoptysis. Chest pain. About 25% of the patients have chest pain as the first symptom. It often appears as irregular vague or dull pain in the chest. In most cases, peripheral lung cancer invades the mural pleura or chest wall, causing sharp and intermittent pleuritic pain that evolves into constant drilling pain if it continues to progress. Mild chest discomfort that is difficult to localize is sometimes associated with central-type lung cancer invading the mediastinum or involving blood vessels or peribronchial nerves, while 25% of patients with malignant pleural effusion complain of dull chest pain. Persistent sharp and severe chest pain that is not easily controlled by drugs often indicates extensive pleural or chest wall invasion. Persistent pain in the shoulder or back of the chest suggests the possibility of tumor invasion in the lung lobe near the mediastinum. What are the manifestation symptoms of lung cancer CT examination 7 manifestation symptoms of lung cancer CT examination Lobular sign. Multiple curved manifestations with more obvious concave and convex tumor margins, with the curvature of the lobulated part as the standard: chord distance/chord length >2/5 is deep lobulation. It is related to the varying degree of tumor cell differentiation and different growth rate in each site. Obvious depression and lobulation can be formed at the site of bronchus, vascular entry and exit of tumor and pleural entrapment, CT examination: the incidence is 80%. Spine-like protrusion. A kind of thick and blunt “pestle-like” structure between lobulation and burr, with infiltration of lung cancer cells. Burr sign. A spine-like or burr-like protrusion of varying degrees at the edge of the mass, seen only at the interface between the mass and the lung parenchyma. Generally speaking, the burrs of peripheral lung cancer are short burrs, while the long and sparse burrs of tuberculoma and chronic inflammation are called long burrs. Pleural depression sign. A linear or triangular image between the tumor and the pleura. The incidence is about 50%, and adenocarcinoma and fine bronchoalveolar carcinoma are more common. Formation conditions: fibrotic contraction in the direction of the tumor, no thickening adhesions in the pleura, fibrosis within the tumor – the underlying dynamics. Influencing factors: distance of the tumor from the wall pleura. Vacuolar sign. Small focal translucent areas within the nodule, less than 5 MM in diameter, mostly seen in adenocarcinoma and fine bronchoalveolar carcinoma, CT examination: incidence 24-48%. Pathologic basis of the vacuolar sign: unoccupied lung tissue, unclosed fine bronchioles, air-containing lacunae between papillary carcinoma structures, unclosed or melted, destroyed, and enlarged alveolar cavities. Fine bronchial inflation sign. Thin strips of air-dense shadow with a diameter of about 1 mm, the incidence is about 33.3% or so. Pathologic basis: dilated fine bronchioles. Calcification. CT examination: the incidence is 6-7%, patchy calcification is located in the center of the tumor, which occurs after tumor necrosis; nodular calcification is mostly located in the periphery, which is caused by the tumor wrapping the original calcification. The above are the symptoms of CT examination of lung cancer, and the meanings of different symptoms are different.