Fig. 1
Endorectal
ultrasound a, Gray scale ultrasound showed a cystic mass in the
submucosa, with clear boundary, poor internal transmission, and
continuous echogenicity in the mucosal layer (yellow arrow). b, Color
Doppler ultrasound showed a small amount of blood flow signal around the
cystic mass, no obvious blood flow signal inside, and continuous
echogenicity in the serous layer of the intestinal wall (yellow arrow).
Contrast-enhanced computed tomography (CECT): A round-like low-density
lesion with a size of 3.1x2.4x2.2cm was observed in the submucosa of the
anterior wall of the middle rectum, with calcification on the edge and
no obvious enhancement. The rectal mucosa was smooth, the rectal wall
was intact, the surrounding fatty space was clear, and no enlarged lymph
nodes were seen (Figure 2).