Acute gall bladder in peritoneal carcinomatosis
In most cases, the cause for a peritoneal carcinomatosis is not a tumor of the peritoneum itsself, but a malignant tumor of another organ lying in the peritoneum. That is mostly an already highly advanced metastasized tumor of the gastrointestinal tract, the pancreas, or the ovaries. In some cases, it's impossible to identify a primary tumor.
