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Atypically enhancing hepatic cavernous hemangiomas: high-spatial-resolution gadolinium-enhanced triphasic dynamic
H Kato1, M Kanematsu, M Matsuo
1Department of Radiology, Gifu University School of Medicine, 40 Tsukasamachi, Gifu 500-8705, Japan.
European Radiology
|December 6, 2001
Summary
High-spatial-resolution MRI helps characterize hepatic cavernous hemangiomas. Atypical enhancement patterns, especially minimal peripheral enhancement, may require further investigation to differentiate from metastases.
Area of Science:
- Radiology
- Medical Imaging
Background:
- Hepatic cavernous hemangiomas are common benign liver tumors.
- Accurate diagnosis is crucial to differentiate from malignant lesions.
Purpose of the Study:
- To investigate the appearance and frequency of atypically enhancing hepatic cavernous hemangiomas.
- To evaluate the utility of high-spatial-resolution dynamic gradient-recalled-echo (GRE) MRI.
Main Methods:
- Retrospective review of 132 hepatic cavernous hemangiomas in 95 patients.
- Analysis of gadolinium-enhanced triphasic dynamic GRE MR images with high spatial resolution (512x224 matrix).
Main Results:
- Thirty percent (40/132) of lesions showed atypical enhancement.
- Smaller hemangiomas (< or =15 mm) more frequently showed early enhancement (29%).
- Minimal peripheral enhancement was observed in 6% of lesions, with slight hyperintensity on T2-weighted images in 2%.
Conclusions:
- High-spatial-resolution dynamic GRE MRI effectively reveals enhancement characteristics of hemangiomas.
- While T2-weighted signal intensity is informative, atypical findings warrant further evaluation to exclude hypovascular metastases.