Related Experiment Video
Updated: May 5, 2026
Multimodality Diagnosis of Mesenteric Ischemia
Published on: July 21, 2023
Mesenteric ischemia: the importance of differential diagnosis for the surgeon
Background:
Intestinal ischemia is an abdominal emergency that accounts for approximately 2% of gastrointestinal illnesses. It represents a complex of diseases caused by impaired blood perfusion to the small and/or large bowel including acute arterial mesenteric ischemia (AAMI), acute venous mesenteric ischemia (AVMI), non occlusive mesenteric ischemia (NOMI), ischemia/reperfusion injury (I/R), ischemic colitis (IC). In this study different study methods (US, CT) will be correlated in the detection of mesenteric ischemia imaging findings due to various etiologies.
Methods:
Basing on our institutions experience, 163 cases of mesenteric ischemia/infarction from various cases, investigated with CT and undergone surgical treatment were retrospectively evaluated, in particular trought the following findings: presence/absence of arterial/venous obstruction, bowel wall thickness and enhancement, presence/absence of spastic reflex ileus, hypotonic reflex ileus or paralitic ileus, mural and/or portal/mesenteric pneumatosis, abdominal free fluid, parenchymal ischemia/infarction (liver, kidney, spleen).
Results:
To make an early diagnosis useful to ensure a correct therapeutic approach, it is very important to differentiate between occlusive (arterial, venous) and non occlusive causes (NOMI). The typical findings of each forms of mesenteric ischemia are explained in the text.
Conclusion:
The radiological findings of mesenteric ischemia have different course in case of different etiology. In venous etiology the progression of damage results faster than arterial even if the symptomatology is less acute; bowel wall thickening is an early finding and easy to detect, simplifying the diagnosis. In arterial etiology the damage progression is slower than in venous ischemia, bowel wall thinning is typical but difficult to recognize so diagnosis may be hard. In the NOMI before/without reperfusion the ischemic damage is similar to AAMI with additional involvement of large bowel parenchymatous organs. In reperfusion after NOMI and after AAMI the CT and surgical findings are similar to those of AVMI, and the injured bowel results quite easy to identify. The prompt recognition of each condition is essential to ensure a successful treatment.
Insights
Diagnosing mesenteric ischemia requires differentiating between arterial, venous, and non-occlusive causes. Imaging findings vary by etiology, impacting treatment and prognosis for this critical abdominal emergency.
Area of Science:
- Gastroenterology
- Radiology
- Abdominal Surgery
Background:
- Intestinal ischemia is a critical abdominal emergency affecting 2% of gastrointestinal illnesses.
- It encompasses acute arterial mesenteric ischemia (AAMI), acute venous mesenteric ischemia (AVMI), non-occlusive mesenteric ischemia (NOMI), and ischemic colitis (IC).
- Early diagnosis is crucial for effective therapeutic intervention.
Purpose of the Study:
- To correlate imaging findings from ultrasound (US) and computed tomography (CT) in detecting mesenteric ischemia.
- To differentiate between various etiologies of mesenteric ischemia based on imaging characteristics.
- To evaluate the utility of CT in identifying specific findings associated with different types of mesenteric ischemia.
Main Methods:
- Retrospective evaluation of 163 surgically treated mesenteric ischemia/infarction cases.
- Analysis of CT findings including arterial/venous obstruction, bowel wall thickness and enhancement, ileus, pneumatosis, and free fluid.
- Assessment of parenchymal ischemia in liver, kidney, and spleen.
Main Results:
- Differentiating occlusive (arterial, venous) from non-occlusive (NOMI) causes is vital for diagnosis and treatment.
- Venous etiology shows faster damage progression than arterial, with early bowel wall thickening.
- Arterial etiology presents slower progression, with thinning bowel wall, potentially complicating diagnosis.
Conclusions:
- Radiological findings in mesenteric ischemia differ significantly based on etiology.
- Venous ischemia progresses rapidly with detectable bowel wall thickening; arterial ischemia is slower with subtle wall thinning.
- Non-occlusive mesenteric ischemia without reperfusion resembles arterial ischemia with additional organ involvement; post-reperfusion findings resemble venous ischemia.
- Prompt recognition of each condition through imaging is essential for successful treatment outcomes.
