Peritoneal metastases in patients with neuroendocrine neoplasms: a challenging site of metastases with clinical and prognostic implications.

Peritoneal metastases show low prevalence among NEN patients and are most likely to develop in patients with small intestinal NENs and advanced metastatic disease. The presence of PM does seem to be associated with a negative prognostic impact on OS of NEN patients and their identification and prompt treatment is of major importance.