13Diseases of the digestive system Diseases of peritoneum
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Neoplasms of peritoneum or retroperitoneum
Definition Neoplasms of peritoneum and retroperitoneum are the tumour originated from the peritoneum and the structure of the retroperitoneum. The tumour cells are derived from the mesothelium cells, nerve cells, or other soft tissue cells.
Nearby in Diseases of peritoneum
International Classification of Diseases, Eleventh Revision (ICD-11), World Health Organization (WHO) 2019/2021, https://icd.who.int/browse11. Licensed under Creative Commons Attribution-NoDerivatives 3.0 IGO (CC BY-ND 3.0 IGO).
Release 2026-01.
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This page reproduces WHO classification content for reference. It is not
medical advice and must not be used to diagnose or treat. For coding
decisions, consult the official release and your national coding guidelines.
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