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).