6mm hypodense foci in the left lobe of the liver are mostly described objectively by liver imaging, which may be benign lesions (e.g. fatty liver, hemangioma, etc.) or malignant lesions (e.g. hepatocellular carcinoma, etc.) of the liver, as follows: 1. Benign lesions: confined fatty liver, hepatic hemangioma, hepatic adenoma, hepatic cyst, hepatic abscess, confined nodular hyperplasia of the liver, etc. Enhanced CT can help to further identify the nature of the lesion, and hepatic hemangioma often shows the characteristics of “fast in and slow out, gradual enhancement”, and the rest of the lesions are different in various phases of enhanced CT, which is mostly identifiable, and MRI can help to further identify the liver adenoma. MRI can help to further identify hepatic adenoma. 2. Malignant lesions: primary hepatocellular carcinoma, metastatic hepatocellular carcinoma, etc. Primary hepatocellular carcinoma often presents the characteristics of “fast in and out” and “delayed enhancement of the periphery” in enhanced CT, and metastatic hepatocellular carcinoma often presents the “bull’s-eye sign”. Metastatic liver cancer often presents “bull’s eye sign”. If physical examination reveals “6mm low-density foci in the left lobe of liver”, one should go to regular hospitals in time to clarify the nature of lesions for further treatment and handling.