Top 10 unbelievable historical concurrencies. Peritoneal carcinomatosis is a type of secondary cancer that affects the lining of the abdominal cavity, called the peritoneum. It occurs when cancer metastasizes from another part of the body and implants into the lining.n ultrasound can be used to detect cancer in the abdominal cavity. Peritoneal carcinomatosis is a type of secondary cancer that affects the lining of the abdominal cavity, called the peritoneum. View slideshow of images above. Watch the Did-You-Know slideshow.