Fig. 2 Contrast enhanced CT. a, A quasi-circular low-density foci on
plain scan, with smooth rectal mucosa and intact intestinal wall. b-c,
No enhancement was seen in the arterial and venous phases of the lesion.
Contrast-enhanced magnetic resonance imaging (CEMRI): a round-like
signal foci with a size of about 2.3x1.8x1.7cm was seen in the submucosa
of the anterior wall of the middle rectum, T1 showed low signal, T2
showed high signal, DWI showed high signal, ADC showed no reduction, no
obvious enhancement of the foci in contrast enhanced scanning. The
rectal mucosa was smooth, the rectal wall was intact, the surrounding
fatty space was clear, and no obvious enlarged lymph nodes were seen in
the pelvic cavity (Figure 3).