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7413311 
Journal Article 
Approach to a Patient with Peritoneal Metastases with Unknown Primary Site: Focus on Histopathological Evaluation 
Bhatt, A; Parikh, L; Mishra, S; Glehen, O; , 
2020 
Springer Singapore 
Singapore 
Pathology of Peritoneal Metastases 
229-250 
Peritoneal metastases (PM) are usually secondary to other primary tumours whilst some rare tumours arise from the peritoneum itself. In some instances, PM may present in absence of a known primary and a focused search fails to reveal a primary site too. Peritoneal metastases with unknown primary site is a poorly studied entity. There is only one series of 15 cases and few other case reports on this. Some of these tumours may have a good prognosis though majority have high-grade disease with a poor long-term outcome. In this chapter, we look at the common histologies of peritoneal metastases and the pathological approach to determining the primary site.