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Large U-shaped fluid collection sitting between the internal and external anal sphincters with oedema in the puborectalis muscle and mesorectal fat (together with slightly enlarged lymph nodes) as well as the presacral space. Perianal and ischiorectal fat is normal. Note extrinsic compression of the anal lumen, and T2 signal and swelling in the left posterior prostate with marked distension of the bladder indicative of urinary retention.