Although the precise cause of peritoneal cancer is not fully understood, it arises from the uncontrolled proliferation of peritoneal cells due to genetic mutations. Peritoneal carcinomatosis is generally indicative of advanced cancer and is associated with a significantly reduced life expectancy. Tumoral involvement of the peritoneum poses a serious clinical challenge, as treatment can be exceptionally difficult, sometimes even palliative. Tumor cells located within the peritoneal cavity have the potential to disseminate throughout the peritoneum and to adjacent organs. Patients with peritoneal carcinomatosis frequently develop significant fluid accumulation (ascites) in the abdominal cavity due to peritoneal involvement. While peritoneal carcinomatosis is quite rare in infants and young children, it can occasionally be observed in the context of certain pediatric malignancies.