The specimen is an open portion of sigmoid colon measuring 36 cm in length. The wall of the large
bowel is expanded by numerous cystic structures, these are situated predominantly in the
submucosa as seen at the cut edge of the specimen. The cysts are of variable size being empty and
measuring up to 1 cm in maximum extent.
The patient presented with a long history of diarrhoea and abdominal pain. Extensive
pneumotosis coli was diagnosed on sigmoidoscopic examination.