1. Pathology and clinical aspects of LBDH: LBDH is a cystic lesion with a cystic wall composed of bile duct epithelium surrounded by fibrous tissue due to impaired development of tiny bile ducts in the liver during embryonic period III. The lesion may be solitary or multiple, and on CT and MRI images, solitary cases are often misdiagnosed as hepatic cysts or other benign lesions, and no relevant imaging has been reported in the domestic and international literature; LBDH has no clinical symptoms and is usually discovered accidentally during physical examination, surgery or autopsy ll_. Searching the domestic and international literature, there are only a few reports of multiple cases. Since multiple cases are easily confused with multiple hepatic cysts, Caroli’s disease, and certain multiple metastases, recognizing this disease has some clinical significance. 2.Morphology and distribution of LBDH: The distribution of LBDH in the liver is diverse. The distribution of LBDH in the liver is diverse. It can be confined to one segment of the liver, or it can involve several segments of the liver but mainly one segment. The morphology of LBDH is diverse, it can be round, rectangular, columnar, rhombic or polygonal, and rhombic or polygonal is more common, because the cystic wall of LBDH is composed of bile duct epithelium and surrounded by fibrous tissue, which is not easy to expand, although there is some tension, most of the lesions are difficult to form round, and its edge is not as sharp and shiny as that of liver cyst. 3. CT and MRI manifestations of LBDH: The plain CT shows multiple low-density small cystic lesions in the liver, and there is no enhancement in the enhanced scan. Compared to CT, the MRI presentation of LBDH lesions then has higher sensitivity and specificity. On T2wI, the liver parenchyma shows a significantly lower signal, while the LBDH lesion shows a relatively high signal, which can show almost all LBDH lesions and their cystic morphology more clearly. Some authors have concluded by comparison that the number of lesions shown on MRIT2WI is significantly greater than that shown on CT [31. LBDH shows low or partially low signal on T1WI. the application of the FIESTA sequence is more helpful in the diagnosis of LBDH, and according to the composition characteristics of this sequence, it is known that the image characteristics of this sequence respond to the size of the ratio of tissue in voxels to T2/TI. The concentration of bile in the lumen of LBDH lesions varies, so on FIESTA images, tumors with larger cystic cavities and lower bile concentration show significantly high signal, while those with higher bile concentration and smaller cystic cavities (the partial volume effect is more obvious in smaller cystic cavities) show low signal or no signal, which is the reason why the number of irregular cystic lesions is significantly reduced on FIESTA images. This is the reason for the significantly reduced number of irregular cystic lesions shown on FIESTA images.