Pneumatosis cystoides intestinalis (PCI) is a rare condition characterized by multiple intramural pockets of gas filled cysts in the intestinal wall. PCI is usually found incidentally on an imaging study. Many different causes of PCI have been suggested, including mechanical, pulmonary, and bacterial causes. Treatment is usually conservative, including oxygen and antibiotic therapy. We report on two cases of PCI, without symptoms, in a 62-year-old male and a 72-year-old male. Computed tomography showed numerous, small, round, and air densities on the sigmoid colon. Colonoscopy showed numerous, variable-sized, sessile polypoid, balloon-like distended, and protruding subepithelial masses covered with normal colonic mucosa on the sigmoid colon. We observed that when the cyst was stuck with a needle, the size of the cyst was reduced and showed a flat termination. Therefore, we made a diagnosis of PCI and report on the case with references.

• Sei Jin Youn(Department of Internal Medicine, College of Medicine, Chungbuk National University) Corresponding author
• Young Shim Cho(Department of Internal Medicine, College of Medicine, Chungbuk National University)
• Byung Chul Kim(Department of Internal Medicine, College of Medicine, Chungbuk National University)
• Joung Ho Han(Department of Internal Medicine, College of Medicine, Chungbuk National University)
• Soon Man Yoon(Department of Internal Medicine, College of Medicine, Chungbuk National University)
• Hee Bok Chae(Department of Internal Medicine, College of Medicine, Chungbuk National University)
• Seon Mee Park(Department of Internal Medicine, College of Medicine, Chungbuk National University)