New approach for assessing vascular distribution within bone tumors using dynamic contrast-enhanced MRI
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To differentiate benign from malignant bone tumors by analyzing the vascular distribution within bone tumors with dynamic contrast-enhanced MRI.
We studied dynamic contrast-enhanced MRI for 49 bone tumors (22 malignant and 27 benign tumors). Seven small regions of interest (ROI) were set inside the largest portion of each tumor. Four ROI were placed evenly on the periphery and three ROI were placed evenly on the line of the longest breadth within the tumor. The slope of the curve (%Slope) was calculated on the time–intensity curves of the whole tumor and of each ROI. The variance values for the %Slope of the ROI were calculated to assess the dispersion of the intensity change at each ROI within the tumor.
Mean value of the %Slopes of whole tumor regions for malignant bone tumors (70.4 ± 60.3%) was significantly higher than that for benign bone tumors (37.6 ± 52.9%) (P = 0.015), although giant cell tumor (GCT), a locally aggressive tumor, had a relatively higher %Slope. Mean value of the variance of %Slopes for malignant bone tumors (3485.9 ± 5942.5) was significantly higher than that for all benign tumors (470.4 ± 583.9) (P = 0.012), indicating that the %Slope values of seven ROI within malignant bone tumors varied more widely compared with the ROI inside benign bone tumors. GCT also demonstrated a lower value.
Our method of analyzing the signal intensity change at seven separate regions that evaluates the vascular distribution within a tumor could be a useful tool for differentiating between benign and malignant bone tumors.
KeywordsBone tumors Dynamic contrast-enhanced MRI Differential diagnosis
This work was supported in part by a Grant-in-aid for Young Scientists (B) from the Ministry of Education, Culture, Sports, Science and Technology (No.18791040, No.15790792), by a grant from Japan Orthopaedics and Traumatology Foundation Inc. (No.0158), by Grants-in-Aid for Clinical Cancer Research and Grants-in-Aid for Cancer Research (14S-4 and -5) from the Ministry of Health, Labor and Welfare, and by a grant from JSPS Fujita Memorial Fund for Medical Research.
- Egmont-Petersen M, Hogendoorn PC, van der Geest RJ, Vrooman HA, van der Woude H, Janssen JP, Bloem JL, Reiber JH (2000) Detection of areas with viable remnant tumor in postchemotherapy patients with Ewing’s sarcoma by dynamic contrast-enhanced MRI using pharmacokinetic modeling. Magn Reson Imaging 18:525–535PubMedCrossRefGoogle Scholar
- Erlemann RP (1992) Dynamic Gd-DTPA-enhanced MR imaging in the musculoskeletal system. In: Higgins HH, Helms C (eds) Magnetic resonance imaging of the body. Raven Press Ltd., New YorkGoogle Scholar
- Lang P, Honda G, Roberts T, Vahlensieck M, Johnston JO, Rosenau W, Mathur A, Peterfy C, Gooding CA, Genant HK (1995) Musculoskeletal neoplasm: perineoplastic edema versus tumor on dynamic postcontrast MR images with spatial mapping of instantaneous enhancement rates. Radiology 197:831–839PubMedGoogle Scholar