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Gd-DTPA-enhanced MR imaging in mediastinal Hodgkin's disease
G Forsgren1, R Nyman, B Glimelius
1Department of Diagnostic Radiology, University Hospital, Uppsala, Sweden.
Abstract:
Gd-DTPA-enhanced MR imaging of 15 patients with primary mediastinal Hodgkin's disease was done before, during and after treatment. A total of 43 MR examinations were performed. After successful treatment, 13 patients had residual masses with reduced signal intensity (SI) ratio in the T2-weighted images. The majority of these also had decreased contrast enhancement as compared with the corresponding primary tumour. There was a significant positive correlation between the contrast enhancement and the SI ratios in the T2-weighted images of the primary tumours and/or the residual masses. Necrosis was seen in 3 of the primary tumours and one patient had a cystic residual mass. These necrotic/cystic lesions were easier to detect with the use of Gd-DTPA. Low SI ratio in the T2-weighted image and low contrast enhancement of the residual mass seem to indicate residual inactivity. Gd-DTPA facilitates the differentiation between cystic/necrotic and solid lesions.
Insights
Gadolinium-DTPA enhanced MRI effectively detects residual mediastinal Hodgkin's disease after treatment. Reduced signal intensity and contrast enhancement in MRI indicate inactive disease, aiding differentiation of necrotic or cystic lesions.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Mediastinal Hodgkin's disease requires accurate assessment of treatment response.
- Distinguishing residual active tumor from post-treatment changes is crucial.
Purpose of the Study:
- To evaluate the role of Gd-DTPA enhanced MRI in assessing treatment response in primary mediastinal Hodgkin's disease.
- To correlate MRI findings with treatment outcomes.
Main Methods:
- 15 patients with primary mediastinal Hodgkin's disease underwent Gd-DTPA enhanced MRI before, during, and after treatment.
- 43 MRI examinations were analyzed, focusing on signal intensity (SI) ratios in T2-weighted images and contrast enhancement.
- Correlation between MRI parameters and treatment response was assessed.
Main Results:
- After successful treatment, 13 patients showed residual masses with reduced T2-weighted SI ratio and decreased contrast enhancement.
- A positive correlation was found between contrast enhancement, T2-weighted SI ratios, and tumor/residual mass characteristics.
- Gd-DTPA enhanced MRI improved detection of necrotic/cystic lesions.
- Low SI ratio and low contrast enhancement in residual masses suggested inactivity.
Conclusions:
- Gd-DTPA enhanced MRI is valuable for evaluating treatment response in mediastinal Hodgkin's disease.
- Reduced signal intensity and contrast enhancement on MRI can indicate inactive residual disease.
- This technique aids in differentiating between solid, necrotic, and cystic lesions.