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Transverse section of the caudal abdomen at the level of the sacroiliac joint (first sacral vertebra) (Level V). (A) Anatomical section, (B) CT with soft tissue window CT image, and (C) Mediastinum vascular window CT image. Caudal views. 1: Sacrum: body, 2: Sacrum: wing, 3: Ilium: wing, 4: Descending colon, 5: Median sacral artery and vein, 6: Internal iliac artery, 7: Common iliac vein, 8: External iliac artery, 9: Cranial rectal artery, and 10: Abdominal fat
