CT examination of the left lobe of the liver hypodensity with small nodular shadow is mostly abnormal occupying lesions in the left lobe of the liver, which may be benign diseases, such as liver cysts, liver abscesses, etc.. It may be benign disease, such as liver cyst, liver abscess, etc. It may also be malignant tumor, such as liver cancer. However, the specific cause of the disease needs to be diagnosed by other examinations. 1. Benign diseases: Liver cysts, liver abscesses and other diseases can indicate the appearance of small low-density nodular shadows in the liver. Liver cysts may be caused by inflammation, trauma, congenital or parasites, and need further investigation; liver abscess is caused by localized infection of the liver, and in addition to imaging manifestations, the patient will also have systemic symptoms such as right upper pain. 2. Malignant tumor of liver: malignant space-occupying lesions mainly refer to hepatocellular carcinoma, and the CT examination results show that there may be low-density nodular shadows. Hepatocellular carcinoma is one of the more common malignant tumors, which is more harmful, and patients may show a series of symptoms such as fatigue, diarrhea, emaciation and so on. CT examination of the left lobe of the liver low density with small nodular shadows should be combined with tumor markers, blood biochemistry, CT and other tests for further evaluation, and diagnosis should be confirmed by pathological basis.