Value Of MSCT And CTA In Diagnosis And Stage Of Ischemic Colitis

ObjectiveTo explore the value of multislice CT (MSCT) and CT angiography (CTA) in the diagnosis and stage of the ischemic colitis (IC)Materials and MethodsAnalysis of CT of31patients with ischemic colitis confirmed by colonoscopy was made retrospectively. There were6males,25females with average age63years (range37-81years) and consisted of11acute phase (within3days) and21non-acute phase (three days after onset, including subacute phase and chronic phase) All the patients underwent whole abdomen enhanced CT scan. and the acquired data were dealt with post-processing such as multi-planar reconstruction (MPR) and computed tomography angiography (CTA) to analyze the different imaging characteristics between acute phase and non-acute phase. The accuracy of CT diagnosis were compared with colonoscopy.ResultsThe lesion involved more likely on the left half colon, while the rectum part were less affected. Main characters included thickness and layering of intestinal wall, thumb lines, fuzzy or clear peri-intestinal fat. The lesion showed continuous mucous membrane, segmental distribution and lumen stenosis with hydrops abdominis.In31cases with IC confirmed by colonoscopy and pathology, CT diagnostic accordance rate was77.42%(24/31) totally, in which the accordance rate in acute IC was90.90%(10/11)and70.00%(14/20) in non-acute IC. There had significantly statistic difference (P<0.05) between acute phase and non-acute phase in CT features, including thickness of intestinal wall, thumb lines, clarity of peri-intestinal fat and the enhancement degree of submucosa. The positive rate of main vessel of superior mesenteric artery and an inferior mesenteric artery in CTA was12.90%(4/31). MPR showed increased small arteries near the lesion.ConclusionMSCT enhancement scan and the post-processing method such as MPR have high value for the diagnosis and differential diagnosis of IC and is also helpful for the disease staging, which, can promote early therapeutic effects in clinical practice. No thrombus in main vessel of superior mesenteric artery and inferior mesenteric artery on CTA and increased small arterial near the lesion on MPR indicate that IC is a non-vascular thrombosis and is different to acute mesenteric ischemia for preventing thrombolytic therapy.