MRI Plain Fistulogram vs Contrast Fistulogram: Procedure, Uses and Differences
Fistulas are abnormal connections between two organs or between an organ and the skin. Accurate imaging is very important to identify the pathway, branches, and associated complications of a fistula.
MRI is considered one of the best imaging methods for evaluating fistulas because it provides excellent soft tissue contrast and detailed anatomical information.
MRI fistulography can be performed in two ways:
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MRI Plain Fistulogram (Non-Contrast MRI)
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MRI Contrast Fistulogram (Contrast-Enhanced MRI)
In this article, we will explain both techniques, their procedures, and their differences.
What is MRI Plain Fistulogram?
An MRI Plain Fistulogram is an MRI study performed without using contrast injection.
In this technique, special MRI sequences are used to visualize fluid-filled fistula tracts and surrounding inflammation.
The fistula tract usually appears bright on T2-weighted images because it contains fluid or pus.
Common MRI Sequences Used
Radiologists commonly use the following sequences:
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T1-weighted imaging
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T2-weighted imaging
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STIR (Short Tau Inversion Recovery)
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Fat-suppressed sequences
These sequences help identify:
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Primary fistula tract
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Secondary branches
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Associated abscess
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Surrounding inflammation
MRI Plain Fistulogram Procedure
1. Patient Preparation
The patient is screened for MRI safety and positioned on the MRI table.
Usually, a pelvic coil or body coil is used depending on the region being scanned.
2. MRI Imaging
The MRI scan is performed using multiple sequences such as:
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Axial T2-weighted images
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Coronal STIR images
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Axial T1-weighted images
These sequences allow radiologists to visualize the fistula tract and surrounding tissues.
3. Image Interpretation
The radiologist analyzes the images to determine:
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Direction of the fistula
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Presence of abscess
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Involvement of muscles or organs
What is MRI Contrast Fistulogram?
An MRI Contrast Fistulogram is performed using intravenous gadolinium contrast.
Contrast enhancement helps highlight active inflammation, abscess walls, and fistula tracts more clearly.
This technique is especially useful in complex or recurrent fistulas.
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| MRI Plain Fistulogram vs Contrast Fistulogram: |
MRI Contrast Fistulogram Procedure
1. IV Contrast Injection
A gadolinium-based contrast agent is injected through an intravenous line.
2. Contrast MRI Sequences
After contrast administration, additional MRI sequences are performed:
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T1-weighted fat-suppressed post-contrast images
These sequences show enhancement of inflamed tissues and abscess walls.
3. Detailed Evaluation
Contrast MRI helps detect:
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Active fistula tract
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Abscess cavity
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Secondary extensions
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Inflammatory changes
Advantages of MRI Fistulography
MRI fistulography provides several advantages:
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Excellent soft tissue visualization
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No radiation exposure
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Accurate mapping of fistula tracts
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Detection of hidden abscesses
Difference Between MRI Plain Fistulogram and Contrast Fistulogram
| Feature | MRI Plain Fistulogram | MRI Contrast Fistulogram |
|---|---|---|
| Contrast Use | No contrast | Gadolinium contrast used |
| Imaging Detail | Good visualization | More detailed evaluation |
| Detecting Abscess | Possible | More accurate |
| Inflammation Detection | Limited | Excellent |
| Best Use | Simple fistulas | Complex or recurrent fistulas |
Conclusion
Both MRI Plain Fistulogram and MRI Contrast Fistulogram are important imaging techniques used to evaluate fistula tracts.
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MRI Plain Fistulogram is usually the first step in imaging fistulas.
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MRI Contrast Fistulogram provides additional information in complex cases and helps detect inflammation and abscesses.
MRI has become the gold standard imaging method for evaluating perianal fistulas and complex fistula tracts.
✔ Radiographic Gyan Tip for Students:
Always include T2-weighted and STIR sequences while performing MRI fistulography because fistula tracts are best visualized on fluid-sensitive sequences.
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