Longitudinal 3.0T MRI analysis of changes in lymph node volume and apparent diffusion coefficient in an experimental animal model of metastatic and hyperplastic lymph nodes
Article first published online: 20 APR 2011
Copyright © 2011 Wiley-Liss, Inc.
Journal of Magnetic Resonance Imaging
Volume 33, Issue 5, pages 1151–1159, May 2011
How to Cite
Klerkx, W. M., Geldof, A. A., Heintz, A. P., van Diest, P. J., Visser, F., Mali, W. P. and Veldhuis, W. B. (2011), Longitudinal 3.0T MRI analysis of changes in lymph node volume and apparent diffusion coefficient in an experimental animal model of metastatic and hyperplastic lymph nodes. J. Magn. Reson. Imaging, 33: 1151–1159. doi: 10.1002/jmri.22539
- Issue published online: 20 APR 2011
- Article first published online: 20 APR 2011
- Manuscript Accepted: 27 JAN 2011
- Manuscript Received: 25 MAY 2010
- diffusion weighted imaging;
- lymphatic metastasis;
- diagnostic imaging
To perform a longitudinal analysis of changes in lymph node volume and apparent diffusion coefficient (ADC) in healthy, metastatic, and hyperplastic lymph nodes.
Materials and Methods:
Three groups of four female Copenhagen rats were studied. Metastasis was induced by injecting cells with a high metastatic potential in their left hind footpad. Reactive nodes were induced by injecting Complete Freund Adjuvant (CFA). Imaging was performed at baseline and at 2, 5, 8, 11, and 14 days after tumor cell injection. Finally, lymph nodes were examined histopathologically.
The model was highly efficient in inducing lymphadenopathy: subcutaneous cell or CFA inoculation resulted in ipsilateral metastatic or reactive popliteal lymph nodes in all rats. Metastatic nodal volumes increased exponentially from 5–7 mm3 at baseline to 25 mm3 at day 14, while the control node remained 5 mm3. The hyperplastic nodes showed a rapid volume increase reaching a plateau at day 6. The ADC of metastatic nodes significantly decreased (range 13%–32%), but this decrease was also seen in reactive nodes.
Metastatic and hyperplastic lymph nodes differed in terms of enlargement patterns and ADC changes. Enlarged reactive or malignant nodes could not be differentiated based on their ADC values. J. Magn. Reson. Imaging 2011;33:1151–1159. © 2011 Wiley-Liss, Inc.