Near the top of L4, the lower poles of the kidneys are seen as well as the numerous vessels in the small bowel mesentery. The lucency around the kidneys is perinephric fat, which tapers above and below the kidneys within Gerota's fascia (see image bilL3018).
At L4, the aortic bifurcation is seen. The narrow descending colon on the left and wide cecum on the right are seen. The appendix is visualized with contrast in the lumen (see
appendectomy). The appendix is retrocecal here as it is in the majority of individuals.
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