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Fig. 1A —Retrorectal tailgut cyst in 25-year-old woman. Sagittal
T2-weighted (A) and axial fat-suppressed contrast-enhanced T1-weighted
(B) MR images show lesion adherent to rectum (arrow, B)
extending from behind anal canal upward into retrorectal space. Lesion
consists of group of cystic lesions surrounded by unenhanced,
low-signal-intensity, fibrous thick wall (arrowheads). Note that main
cystic lesion displays slightly heterogeneous high signal intensity on
T1-weighted image due to mucoid content.
