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A 45-year-old-female with tailgut cyst. (a) Axial T2 weighted, (b) fat-saturated pre-contrast and (c) fat-saturated post-contrast subtraction T1 weighted images (T1WI) through the pelvis showing a presacral multiloculated cystic mass posterior to the rectum without post-contrast enhancement (arrows in a, c). High signal intensity on pre-contrast T1WI (arrow in b), suggesting haemorrhage or proteinaceous debris. Surgical resection confirmed tailgut cyst.
