Isolated rectal adenomatous polyp without genetic background is rarely found in children. A 4-year and 5 month-old girl was admitted for intermittent bloody stools lasting 4 months. A $1.5{ imes}1.2;cm$ sized rectal polyp was found by air contrast barium enema. Endoscopic polypectomy was performed without complications. In histopathologic examination, it was found to be a tubulovillous adenoma. Typical radiologic, colonoscopic, and pathological pictures are presented.