CT Abdomen and pelvis
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Mural thickening and submucosal oedema of the entire colon, measuring up to 12 mm at the caecum. There is a normal enhancement of the colonic mucosa except in the ascending colon where there are small areas of hypoenhancement. Large volume of intermediate density (16HU) free intraperitoneal fluid predominantly in the perihepatic, perisplenic and pelvic spaces. No dilated loops of bowel. No free intraperitoneal gas.
Heterogeneous enhancement of the spleen is likely due to late arterial phase (no opacification of hepatic veins, incomplete enhancement of renal cortex). The remainder of the intra-abdominal and pelvic organs are unremarkable. IDC in situ.
Old wedge compression fractures of T9, T10 and L1. Sclerotic lesion in T8. Bilateral pleural effusions. Right basal consolidation.
Conclusion: Mural thickening and submucosal oedema of the entire colon in keeping with colitis, likely pseudomembranous given the clinical history. Small areas of hypoenhancing mucosa in the ascending colon raise the possibility of necrosis. Ischaemia may be contributing, however, the SMA is seen to opacify normally.