Fig. 5 Endorectal ultrasound. a, Gray scale ultrasound showed a cystic mass in the submucosal layer with clear borders and poor internal transmission, and continuous echogenicity in the mucosal layer (yellow arrow) and serous layer (white arrow). b, CDFI showed a small amount of blood flow signal around the cystic mass, but no obvious blood flow signal inside.
CECT: The anterior wall of the lower part of the rectum at about 50mm from the anal margin, presented a local protuberant change, with a local thickness of about 11mm, and the mucosal surface was smooth. The enhancement of the local submucosal area was not obvious, and a patchy dense shadow was still visible. The perienteric fatty space was clear (Figure 6).