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SPIO-enhanced MR imaging of focal fatty liver lesions
F Lwakatare1, Y Yamashita, M Nakayama
1Department of Radiology, Kumamoto University School of Medicine, 1-1-1 Honjo Kumamoto 860-0811, Japan.
Background:
The purpose of this study was to assess the features of focal fatty liver lesions with superparamagnetic iron oxides (SPIO) on magnetic resonance (MR) images.
Methods:
We retrospectively studied five patients with six histologically proven focal fatty liver lesions who had been examined by MR with use of SPIO. The features of the focal fatty liver lesions on two T2-weighted post-SPIO-enhanced MR images, T2*-weighted fast low-angle shot (FLASH) sequences, and T2-weighted turbo-spin echo (TSE) sequences were analyzed, and the percentages of signal intensity loss of the lesions and normal liver parenchyma were calculated.
Results:
All the fatty liver lesions exhibited different degrees of SPIO uptake, which were presented by a distinct loss of signal intensity on both post-SPIO-enhanced T2-weighted sequences. The percentage of signal intensity loss of the lesions on SPIO-enhanced images was higher than that of normal liver parenchyma in all the cases.
Conclusion:
Focal fatty liver lesions exhibit a high uptake of SPIO. The uptake is higher than that of the normal liver.
Insights
Focal fatty liver lesions show significant uptake of superparamagnetic iron oxides (SPIO) on MRI scans. This uptake, measured by signal intensity loss, is greater in lesions than in normal liver tissue.
Area of Science:
- Hepatology
- Medical Imaging
- Radiology
Background:
- Focal fatty liver lesions (FFLL) are common hepatic abnormalities.
- Accurate characterization of FFLL is crucial for clinical management.
- Superparamagnetic iron oxides (SPIO) are contrast agents used in MRI.
Purpose of the Study:
- To evaluate the imaging features of focal fatty liver lesions using SPIO-enhanced MRI.
- To assess the SPIO uptake characteristics of FFLL compared to normal liver parenchyma.
Main Methods:
- Retrospective analysis of six histologically proven FFLL in five patients.
- MRI examinations included T2-weighted post-SPIO enhancement, T2*-weighted FLASH, and T2-weighted TSE sequences.
- Quantification of signal intensity loss in lesions and normal liver parenchyma.
Main Results:
- All FFLL demonstrated varying degrees of SPIO uptake.
- SPIO uptake resulted in a distinct signal intensity loss on post-SPIO T2-weighted images.
- Signal intensity loss was consistently higher in FFLL than in normal liver parenchyma.
Conclusions:
- Focal fatty liver lesions exhibit a high degree of SPIO uptake.
- SPIO-enhanced MRI can differentiate FFLL from normal liver based on signal intensity changes.
- These findings highlight the utility of SPIO in characterizing hepatic lesions.