Kidneys are retroperitoneal. There are in the abdominal cavity, but not in the peritoneal cavity.
An organ can be in the abdominopelvic cavity but not the peritoneal cavity if the organ sits below the diaphragm but outside the peritoneal membranes. The kidneys, which are behind the peritoneal membrane (retroperitoneal) are such organs.
The peritoneal cavity (within the abdomen)
All humans have a peritoneal cavity.
The Lesser omentum suspends the stomach from the liver and the Small intestine are all suspended from wall by mesentery of small intestine
The kidneys are located in the peritoneal cavity. Infection of this cavity is called peritonitis, and can be deadly. Dialysis can be done by instilling dianeal solution into the peritoneal cavity, and allowing the semipermiable membranes surronding the kidneys, and other organs to "clean themselves." This process is called peritoneal dialysis.
The peritoneal membrane lines the peritoneal cavity.
Peritoneal cavity
No, it's not possible for a suture or clip in the peritoneal cavity to migrate to the brain.
Because the female reproductive tract is continuous with the peritoneal cavity through the fallopian tubes, it is possible for sperm to enter the peritoneal cavity.
Peritoneal cavity is to be accessed to remove the gall bladder either by open method or by laparoscopic cholecystectomy. Peritoneal cavity is the abdominal cavity in other word. The gallbladder connects the liver to the small intestine and carries bile to the food coming from the stomach.
Because it's meant for dwelling within the abdomen cavity (aka peritoneal cavity), it doesn't enter the circulatory system. Parenteral solutions are for intravenous (into the vein) administration.