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Transudative vs exudative pleural effusions: differentiation using Gd-DTPA-enhanced MRI
C Frola1, S Cantoni, I Turtulici
1IV Divisione Radiologica, Ospedale S. Martino, V. le Benedetto XV, 10, I-16132 Genova, Italy.
European Radiology
|January 1, 1997
Summary
Gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA)-enhanced MRI can differentiate pleural effusions. Exudative effusions show significant enhancement, while transudative effusions do not, aiding diagnosis.
Area of Science:
- Radiology
- Medical Imaging
- Diagnostic Medicine
Background:
- Distinguishing between exudative and transudative pleural effusions is crucial for appropriate patient management.
- Conventional diagnostic methods can be invasive and may not always provide definitive differentiation.
Purpose of the Study:
- To evaluate the efficacy of Gd-DTPA-enhanced Magnetic Resonance Imaging (MRI) in differentiating exudative from transudative pleural effusions.
- To assess the diagnostic performance of MRI in identifying effusion types based on contrast enhancement patterns.
Main Methods:
- MRI examinations were conducted on 22 patients with pleural effusions (10 transudative, 12 exudative).
- T1-weighted SE images were acquired before and 20 minutes after intravenous administration of Gd-DTPA (0.1 mmol/kg).
- Image analysis included both visual assessment and quantitative measurement of signal intensity ratios (SIRs) to evaluate enhancement.
Main Results:
- None of the 10 transudative effusions showed significant Gd-DTPA enhancement.
- 10 out of 12 exudative effusions demonstrated significant enhancement (sensitivity 83%, specificity 100%, PPV 100%).
- Postcontrast SIRs were significantly higher in exudates compared to precontrast SIRs and compared to transudates (P=0.0109, P=0.0300).
Conclusions:
- Gd-DTPA-enhanced MRI effectively differentiates exudative from transudative pleural effusions.
- Significant signal enhancement post-Gd-DTPA administration suggests an exudative effusion, likely due to increased pleural permeability.
- Absence of enhancement suggests a transudate, but an exudative effusion cannot be entirely excluded.