Recurrent undifferentiated embryonal sarcoma of the liver in adult patient treated by pembrolizumab: A case report

Figure 1 Timeline of the case. PET-CT: Positron emission tomography-computed tomography; PTCD: Percutaneous transhepatic cholangial drainage.

Figure 2 Positron emission tomography-computed tomography. A-C: Radioactive concentration of 18F-fluorodeoxyglucose on the tumor rim, and no radioactive concentration was observed in other areas of the body.

Figure 3 Positron emission tomography-computed tomography. A-D: Multiple metastases located in the liver, mediastinum and peritoneum.

Figure 4 Positron emission tomography-computed tomography. A-C: Multiple metastases had nearly disappeared.

Figure 5 Immunohistological staining. A-D: There was high expression of CD8, low expression of CD4 and little expression of CD68 in the tumor. Up to 90% of tumor cells expressed programmed death ligand 1 (PD-L1).