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Rectosacral fascia (RSF) at the S3 level (individual variation). (A) Before separation of the two layers of the RSF; (B) after separation of the two layers of the RSF. Red arrows: upper and lower layers of the RSF; white arrows: pre-hypogastric fascia; 1: the rectum; 2: the mesorectum; 3: the urinary bladder; 4: the hypogastric nerve; 5: the ureter.
