Fig. 3
Pathological classification of pseudomyxoma peritonei in the 2016 consensus of the Peritoneal Surface Oncology Group International. a, b: Acellular mucin, without identifiable tumor cells in the disseminated peritoneal mucinous deposits; c, d Low-grade mucinous carcinoma peritonei, with tumor cells forming band-, island-, wave- or cluster-shaped tissue. Cancer cells present with a monolayer or pseudostratified arrangement, with slight nucleus atypia and rare mitotic figures; e, f High-grade mucinous carcinoma peritonei, with a complex structure presenting band-, island-, gland-, cribriform-shaped tissue, abundant cellularity, and at least local regional severe atypia; g, h High-grade mucinous carcinoma peritonei with signet ring cells, with abundant signet ring cells floating in the mucous pools. All sections were stained with H&E