The diseases that may appear at the junction of the right and left lobes of the liver include hepatic hemangioma, hepatic cyst, hepatic malignant tumor, etc. If hepatic hemangioma, hepatic cyst, etc. are not serious, and if they are malignant tumors, etc. are more serious, you should go to the hospital for clarification of the primary pathology. 1. The presence of low density foci at the junction of right and left lobes of the liver is considered as hepatic hemangioma, which is a benign tumor and most of them are not dangerous. Hepatic hemangioma can be manifested as a regular and clear round low density foci in the liver parenchyma, or irregular low density shadow. 2. Hepatic cysts can be manifested as round, homogeneous and slightly low-density shadows with clear boundaries in the imaging examination, most of the hepatic cysts are not dangerous and belong to benign lesions. 3. Malignant tumors of the liver can also be manifested as low density foci on imaging. It should be noted that malignant tumors lead to more serious imaging symptoms, and it is necessary to carry out further examination in time to confirm the diagnosis and determine whether it is the primary foci or metastatic foci. Patients presenting with hepatic hemangioma and hepatic cysts need to be regularly observed to see if the hemangiomas and cysts have a tendency to rapidly increase in size. Malignant tumors are more serious and should be alerted to the need to seek medical attention as soon as possible to determine the primary cause and standardize treatment.