Abstract
This is a case of a 4-year-old boy having nephrotic syndrome with peritonitis. He had a sudden of bloody vomit and abdominal pain, and it was suspected intussusception. In emergency operation, only finding was the ascites. The labolatory finding included proteinuria, hypoproteinemia, hypercholesterolemia and edema. Also the blood culture showed the presence of Strept. pneumoniae. Consequently we diagnosed him nephrotic syndrome with peritonitis caused by Strept. pneumoniae. Postoperatively he was treated with steroid and well responded.