Fig. 2 a

The lower lobe tumor was white, soft, and lobular; had a clear border (8.8 × 7.2 cm); and the contents had split. b. Hematoxylin and eosin-stained image showing that the tumor cells had unusual nuclei and increased pleomorphic cytoplasm with broad necrosis. There were numerous lipid droplets within the tumor cells, which were mixed with nuclear lipoblasts. This field contains highly differentiated findings. c. This field contains dedifferentiated findings. d. Negative immunohistochemistry for MDM2. e. Negative immunohistochemistry for CDK4