Pneumatosis cystoides intestinalis (PCI) is a rare condition defined as the presence of multiple gas-filled cysts in the wall of gastrointestinal tract. The etiology and pathogenesis of PCI remain uncertain. It is associated with various medicosurgical conditions, including various pulmonary and gastointestinal diseases, connective tissue diseases and endoscopic procedures. The diagnosis is confirmed by endoscopic puncture and biopsy. PCI in adults, for the most part, show a benign clinical course and better prognosis if the associated disease is well controlled. Infantile PCI is more serious condition and especially associated with necrotizing enteritis. The treatment is usually conservative, However surgical intervention is needed when complications such as intussusception, obstruction, bleeding and perforation develope. We experienced a case of PCI found during the follow-up colonoscopy in a patient taken right hemicolectomy and systemic adjuvant chemotherapy due to colon cancer.