Fig. 3

Histopathological findings. A Findings on positron emission tomography-computed tomography (PET-CT) around the biopsy lesion before chemotherapy (white circle). B Histologically the tumor was diagnosed as biphasic mesothelioma and many viable cells were observed (HE × 200). C There was no fibrotic area in the tumor (Elastica-Masson × 40). D Findings on PET-CT around the biopsy lesion after chemotherapy (white circle). E Surrounding the fibrotic area, tumor cells are scattered and most of them are degenerated and some cells had enlarged nucleus (black arrows) (HE × 200). F Blue colored fibrotic change was widely observed after chemotherapy (Elastica-Masson × 40)