01-01-2016 | Scientific Article
Triple-phase contrast-enhanced MRI for the prediction of preoperative chemotherapeutic effect in patients with osteosarcoma: comparison with 99mTc-MIBI scintigraphy
Published in: Skeletal Radiology | Issue 1/2016
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Objective
This study aims to determine whether 99mTc-MIBI scintigraphy and triple-phase contrast-enhanced magnetic resonance imaging (TCE-MRI) performed during and after preoperative chemotherapy have the power to predict final chemotherapeutic effects in patients with osteosarcoma (OS).
Materials and methods
Seventeen patients underwent 99mTc-MIBI scintigraphy and TCE-MRI before and after the middle and last courses of preoperative chemotherapy. As for 99mTc-MIBI scintigraphy, an uptake ratio (UR) and a reduction rate of UR (ΔURMIBI) were calculated. As for TCE-MRI, a ratio of contrast to background (CTB) was calculated in the whole tumor area (WA) at each phase on dynamic T1-weighted fat suppression images. Then a ratio of signal (R
WA) was calculated by dividing CTB at triple-phase by CTB at pre-phase.
Results
Nine and eight patients showed good and poor response in histopathologic evaluation. The sensitivity, specificity, and accuracy for the prediction of histopathological chemotherapeutic effect was 44, 100, 69 % in R
WA at the first phase, 100, 75, 88 % in ΔURMIBI after the middle course, 88, 100, 94 % in R
WA at the first phase, and 100, 75, 88 % in ΔURMIBI after the last course of the preoperative chemotherapy, respectively.
Conclusion
Both 99mTc-MIBI scintigrapy and TCE-MRI can predict the tumor response in patients with OS after the completion of the preoperative chemotherapy.