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Fig. 11A 28-year-old man with mucinous rectal adenocarcinoma. Coronal
T2-weighted MR image shows large ill-circumscribed mass involving rectum and
extending downward into anal canal (arrowhead), laterally to left
levator ani muscle (arrow), and into mesorectum and supralevator
space. No extension is visible in ischiorectal fossa. Lesion is brighter than
fat.