From: Prognostic indicators in peritoneal carcinomatosis from gastrointestinal cancer
Features | DPAM | PMCA |
---|---|---|
Primary site | Appendix | Appendix, colon, small intestine |
Primary diagnosis | Mucinous adenoma usually in a mucocoele | Mucinous adenocarcinoma |
Surgical appearance | Mucinous tumors and mucinous ascites with redistribution | Carcinomatosis with variable amounts of mucinous ascites, redistribution is prominent with large volume of ascites |
Peritoneal tumor | Â | Â |
• Cellularity | Scant | Moderate to abundant |
• Morphology | Abundant extracellular mucin containing simple to focally proliferative mucinous epithelium. There is a single layer of cells | Moderate to abundant extracellular mucin containing extensively proliferative mucinous epithelium or mucinous glands, clusters of cells, or individual cells consistent with carcinoma |
• Cytologic atypia | Minimal | Moderate to marked |
• Mitotic activity | Rare | Infrequent to frequent |
Lymph node involvement | Almost never | Moderate |
Liver metastases | Almost never | Very infrequent |
Parenchymal organ invasion | Rare (except ovary) | Frequent |