CT and MR Imaging Findings of Bowel Ischemia from Various Primary Causes

Rha, Sung Eun; Ha, Hyun Kwon; Lee, Soo-Hyun; Kim, Ji-Hoon; Kim, Jeong-Kon; Kim, Jung Ho; Kim, Pyo N.; Lee, Moon-Gyu; Auh, Yong Ho

doi:10.1148/radiographics.20.1.g00ja0629

Cited by 257 publications

(119 citation statements)

References 33 publications

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“…Most common locations include splenic flexure and rectosigmoid colon. Segmental wall thickening with layered appearance or target sign is seen on enhanced scan [15]. Pneumatosis may be seen in advanced disease.…”

Section: Enhancement Patternmentioning

confidence: 99%

Multidetector Computed Tomography in Large Bowel Lesions—A Study of 100 Cases

et al. 2011

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This study aims to evaluate the role of multidetector computed tomography (MDCT) in detecting and classifying the large bowel lesions. A prospective study of 100 adult patients was conducted from June 2007 to October 2009. Rectal and IV contrast were used for three dimensional reconstruction. Angiography was performed in cases of suspected ischemic pathology. CT colongraphy was done to evaluate adenomas. CT findings were correlated and confirmed by either colonoscopy, biopsy, postoperative findings or follow-up CT. The pathologies were common in 50-70 yrs (44%). M: F ratio was 2:1. Malignant lesions were seen in (55%) followed by inflammatory lesions in 26%, diverticulitis and ischemic colitis in 6% each. Miscellaneous conditions like polyps, volvulus and intussusceptions were seen in 7%. Adenocarcinoma was the common malignancy (81.2%). Present study showed that adenocarcinomas were associated with marked thickening of bowel wall (>1.5 cm) in 85.4% of patients, asymmetrical wall thickening (96.4%), focal involvement (length <10 cm) in 85.5% with heterogeneous post contrast enhancement (96.3%). Inflammatory lesions showed mild thickening (69%),segmental or diffuse involvement (77%), symmetrical wall thickening (89%) and homogenous post contrast enhancement (81%). Ischemic lesions showed marked thickening (83.4%), symmetrical thickening (100%) and homogenous enhancement (100%). Diverticulitis showed marked thickening (100%), asymmetrical wall thickening (66.7%) with heterogeneous post contrast enhancement (100%), with pericolic fluid. Arterial/venous thrombosis was diagnosed in 66.66%. Three per cent had benign adenomatous polyps on CT colonographic studies. MDCT was accurate in 98.2% cases for differentiating between benign and malignant etiology and is the modality of choice.

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Section: Enhancement Patternmentioning

confidence: 99%

Multidetector Computed Tomography in Large Bowel Lesions—A Study of 100 Cases

et al. 2011

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“…In addition, the presence of barium may compromise subsequent diagnostic tests, such as computed tomography (CT) and angiography [32] . Magnetic resonance imaging has shown promising results in detecting mesenteric ischemia but remains a slow-processing technique that seems to be inadequate in an emergent situation such as AMI [39,40] . Mesenteric duplex sonography is a highly userdependent modality that can only confirm diminished blood flow in the trunks of the mesenteric blood vessels.…”

Section: Imaging Studiesmentioning

confidence: 99%

Acute mesenteric ischemia after cardio-pulmonary bypass surgery

Abboud¹,

Daher²,

Boujaoude³

2008

WJG

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Acute mesenteric ischemia (AMI) is a highly-lethal surgical emergency. Several pathophysiologic events (arterial obstruction, venous thrombosis and diffuse vasospasm) lead to a sudden decrease in mesenteric blood flow. Ischemia/reperfusion syndrome of the intestine is responsible for systemic abnormalities, leading to multi-organ failure and death. Early diagnosis is difficult because the clinical presentation is subtle, and the biological and radiological diagnostic tools lack sensitivity and specificity. Therapeutic options vary from conservative resuscitation, medical treatment, endovascular techniques and surgical resection and revascularization. A high index of suspicion is required for diagnosis, and prompt treatment is the only hope of reducing the mortality rate. Studies are in progress to provide more accurate diagnostic tools for early diagnosis. AMI can complicate the post-operative course of patients following cardio-pulmonary bypass (CPB). Several factors contribute to the systemic hypo-perfusion state, which is the most frequent pathophysiologic event. In this particular setting, the clinical presentation of AMI can be misleading, while the laboratory and radiological diagnostic tests often produce inconclusive results. The management strategies are controversial, but early treatment is critical for saving lives. Based on the experience of our team, we consider prompt exploratory laparotomy, irrespective of the results of the diagnostic tests, is the only way to provide objective assessment and adequate treatment, leading to dramatic reduction in the mortality rate.

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“…Changes that have been reported include bowel wall thickening and edema, submucosal hemorrhage, increased or decreased enhancement of the bowel wall, mesenteric stranding or fluid, and pneumatosis intestinalis. [10][11][12][13] However, these morphologic descriptions are not adequate for the early detection of reversible bowel ischemia. A recent study reported that spiral CT demonstrated a sensitivity and specificity of 64% and 92%, respectively, for diagnosing mesenteric ischemia.…”

mentioning

confidence: 99%

Imaging of Acute Mesenteric Ischemia Using Multidetector CT and CT Angiography in a Porcine Model

Rosow

Sahani

Strobel

et al. 2005

Journal of Gastrointestinal Surgery

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Acute mesenteric ischemia, a frequently lethal disease, requires prompt diagnosis and intervention for favorable clinical outcomes. This goal remains elusive due, in part, to lack of a noninvasive and accurate imaging study. Traditional angiography is the diagnostic gold standard but is invasive and costly. Computed tomography (CT) is readily available and noninvasive but has shown variable success in diagnosing this disease. The faster scanning time of multidetector row CT (M.D.CT) greatly facilitates the use of CT angiography (CTA) in the clinical setting. We sought to determine whether M.D.CT-CTA could accurately demonstrate vascular anatomy and capture the earliest stages of mesenteric ischemia in a porcine model. Pigs underwent embolization of branches of the superior mesenteric artery, then imaging by M.D.CT-CTA with three-dimensional reconstruction protocols. After scanning, diseased bowel segments were surgically resected and pathologically examined. Multidetector row CT and CT angiography reliably defined normal and occluded mesenteric vessels in the pig. It detected early changes of ischemia including poor arterial enhancement and venous dilatation, which were seen in all ischemic animals. The radiographic findings-compared with pathologic diagnoses-predicted ischemia, with a positive predictive value of 92%. These results indicate that M.D.CT-CTA holds great promise for the early detection necessary for successful treatment of acute mesenteric ischemia. KeywordsMesenteric ischemia; computed tomography; angiography; animal model Acute mesenteric ischemia, the process of insufficient blood supply to the bowel, carries consequences ranging from a transient, totally reversible insult to a lethal event. The prevalence of mesenteric ischemia is increasing in the United States as the population ages. It is estimated that nearly 1% of patients presenting with acute abdominal pain have ischemic intestinal disease, 1-3 and it may be responsible for 0.1% of all hospital The lethality of the disease is well documented, with some series reporting mortality rates exceeding 60%. [4][5][6][7] A critical factor for survival of acute mesenteric ischemia is early diagnosis and intervention. In cases of superior mesenteric artery (SMA) embolism in which surgery is performed once the bowel is infarcted, the mortality rate nearly doubles from 35% to 68%. 8 The mean duration of ischemia preceding surgery for noninfarcted bowel is 13 hours, compared with 21 hours for those with infarction. 9 Thus, the window of opportunity for intervention is narrow and prompt diagnosis is crucial for patient survival. Nevertheless, this goal remains elusive, due in part to the lack of an accurate diagnostic imaging tool. NIH Public AccessAlthough angiography is considered the standard of reference for the diagnosis of mesenteric ischemia, it is not widely used because it is invasive, time-consuming, and costly. Computed tomography has been historically used with variable success for evaluating small bowel ischemia. It can help dete...

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CT and MR Imaging Findings of Bowel Ischemia from Various Primary Causes

Cited by 257 publications

References 33 publications

Multidetector Computed Tomography in Large Bowel Lesions—A Study of 100 Cases

Multidetector Computed Tomography in Large Bowel Lesions—A Study of 100 Cases

Acute mesenteric ischemia after cardio-pulmonary bypass surgery

Imaging of Acute Mesenteric Ischemia Using Multidetector CT and CT Angiography in a Porcine Model

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