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[Benign hepatic tumors: MRI features before and after administration of superparamagnetic contrast media]
T V Bartolotta1, M Midiri, M Galia
1Istituto di Radiologia Pietro Cignolini, Policlinico Universitario, Palermo, Italy.
Purpose:
To assess the yield of superparamagnetic iron oxide (SPIO)-enhanced MR images in the detection and characterization of benign hepatic tumors and to evaluate the potential role and safety of SPIO administration in the diagnosis of these tumors.
Material And Methods:
Eighteen patients underwent MRI before and after administration of SPIO particles. Spin echo (SE) T1, DP, T2 and Gradient echo (GE) T2* images were acquired with a.5 T superconductive unit. MR diagnosis was bioptically proved in 12 patients. In the remaining six patients, who had hemangiomas only, diagnosis was confirmed by at least two imaging techniques-such as MR, CT, ultrasonography, radio-labeled red cells scintigraphy-and by both clinical and imaging follow-up.
Results:
Thirthy-four tumors were detected on the MR images: 29/34 (85,3%) before and 33/34 (97%) after SPIO administration - 6 focal nodular hyperplasias (FNH), 6 adenomas and 22 hemangiomas. One small tumor (adenoma) was detected on the unenhanced MR images only, while 4 lesions (3 adenomas, 1 FNH) were detected after SPIO administration only.
Discussion:
SPIO-enhanced MRI increased the detection rate of benign hepatic tumors compared to non-enhanced MRI. Iron oxide was also useful in the characterization of such lesions as it was able to demonstrate any heterogeneity resulting from the presence of central scars or septa. Nevertheless, in our experience it was useful to compare baseline with SPIO-enhanced MRI, even if time consuming. Indeed the uptake of iron oxide particles by well-differentiated lesions and normal hepatic parenchyma, is comparable, so that well-differentiated lesions appear isointense and therefore undetectable.
Conclusions:
In our experience, although numerically limited, SPIO-enhanced MRI was clinically safe and more effective than non-enhanced MRI in both the detection and characterization of benign hepatic tumors, providing useful clues for diagnosis.
Insights
Superparamagnetic iron oxide (SPIO)-enhanced MRI significantly improves the detection and characterization of benign liver tumors compared to non-enhanced MRI. This advanced imaging technique offers enhanced diagnostic accuracy for conditions like focal nodular hyperplasia and adenomas.
Area of Science:
- Radiology and Medical Imaging
- Hepatobiliary Diseases
- Oncology
Context:
- Benign hepatic tumors pose diagnostic challenges.
- Accurate detection and characterization are crucial for appropriate patient management.
- Conventional MRI may have limitations in differentiating certain lesions.
Purpose:
- To evaluate the efficacy of superparamagnetic iron oxide (SPIO)-enhanced MRI in detecting and characterizing benign hepatic tumors.
- To assess the diagnostic yield and safety of SPIO administration in liver tumor diagnosis.
Summary:
- SPIO-enhanced MRI detected 97% of benign hepatic tumors compared to 85.3% with non-enhanced MRI.
- The technique improved characterization by revealing lesion heterogeneity.
- Six focal nodular hyperplasias, six adenomas, and 22 hemangiomas were identified.
Impact:
- SPIO-enhanced MRI offers a safer and more effective diagnostic tool for benign liver tumors.
- It provides valuable diagnostic clues, potentially reducing the need for invasive procedures.
- Further research with larger cohorts can solidify its role in clinical practice.