Abdominal pain during peritoneal dialysis can be due to an inflow pain or most frequently be associated with peritonitis. However, other unusual pathologies can also occur in patients with peritoneal dialysis. Herein, pelvic inflammatory disease in a pediatric peritoneal dialysis patient is presented. After exclusion of the most common causes, abdominal ultrasonography and laparoscopy will guide clinicians for the diagnosis of the other rare diseases in patients with peritoneal dialysis.