Fig. 2

Peritoneal biphasic malignant mesothelioma subtypes was shown on hematoxylin and eosin-stained sections. a The biphasic pattern is characterized by epithelioid cells with papillo-tubular structure (white arrow) and sarcomatoid components (black arrow). Bleeding was observed in some areas (gray arrow) (original magnification × 100). b Sarcomatoid components have hypercellular short shuttle-like or round cell, which arranged disorderly (original magnification × 400) c Immunohistochemistry showed the positive rate of Ki-67 was less than 10% (original magnification × 400), which suggests that tumor cell proliferation is relatively inactive