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MR imaging of the normal appendix and acute appendicitis
Norihisa Nitta1, Masashi Takahashi, Akira Furukawa
1Department of Radiology, Shiga University of Medical Science, Otsu, Shiga, Japan. r34nitta@belle.shiga-med.ac.jp
Journal of Magnetic Resonance Imaging : JMRI
|January 25, 2005
Summary
Magnetic Resonance Imaging (MRI) accurately diagnoses acute appendicitis and correlates with disease severity. This imaging technique is a valuable alternative, particularly for patients concerned about radiation exposure.
Area of Science:
- Radiology
- Medical Imaging
- Gastrointestinal Imaging
Background:
- Acute appendicitis is a common surgical emergency.
- Accurate diagnosis is crucial to prevent complications.
- Alternative imaging modalities are sought to minimize radiation exposure.
Purpose of the Study:
- To delineate the Magnetic Resonance Imaging (MRI) appearance of a normal appendix.
- To characterize the MR imaging findings of acute appendicitis.
- To correlate MR imaging findings with pathological severity.
Main Methods:
- MRI scans were performed on 20 volunteers (normal appendix) and 37 patients with suspected acute appendicitis.
- Utilized T1-weighted (T1WI), T2-weighted (T2WI), and fat-suppressed T2-weighted (T2SPIR) sequences.
- Established MR criteria for appendicitis included wall thickening, lumen dilation, and periappendiceal tissue changes.
Main Results:
- Normal appendix visualized in 90% of volunteers.
- MRI correctly identified acute appendicitis in 30 of 37 patients, with high correlation to pathological findings.
- Thicker appendiceal walls, increased periappendiceal intensity, and ascites on MRI indicated severe appendicitis.
Conclusions:
- MRI provides accurate diagnosis of acute appendicitis.
- MRI findings correlate well with pathological severity.
- MRI is a powerful alternative diagnostic tool, especially for radiation-sensitive patients.