PMC6914684_01
MRI: Several cysts were located in the retrorectal space, which had a clear border with the sacrum but adhered to the rectal tumor.
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F1
These cysts had a clear border with the sacrum but showed adhesion to the rectal cancer (Figure 1).
PET-CT revealed that the rectal tumor had high FDG accumulation; the cysts did not.
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F2
FDG accumulation in the retrorectal cysts was not enhanced (Figure 2).
Histology revealed that the rectal tumor is a mucinous adenocarcinoma.
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F3
The postoperative pathology indicated that a rectal mucinous adenocarcinoma had invaded retrorectal dermoid cysts (Figure 3).