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Fig. 4. —59-year-old man with fulminant ulcerative colitis in whom incomplete fusion of fascial planes has permitted retromesenteric and retrorenal extension of peritoneal fluid. CT scan shows that ascending (A) and descending (D) mesocolons have not completely fused with renal fascia, permitting ascites (straight arrows) to enter anterior interfascial retromesenteric plane. Posterior renal fascia has also not fused, allowing peritoneal fluid to extend into retrorenal posterior interfascial planes (curved arrows). These anterior interfascial planes are easily surgically dissected during hemicolectomy. Posterior interfascial planes are readily dissected during nephrectomy.