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Sagittal T2-weighted image (a) and T2-weighted coronal image with fat-saturation (b) show an abscess (thick white arrows on a and b) at the level of anorectal junction. There is blind sinus (thin white arrow) extending upward above the pelvic floor. Consecutive coronal T2-weighted images (c–f) show extension of the abscess in the inter-sphincteric planes bilaterally down
