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MRI in primary bone tumors: therapeutic implications
R Golfieri1, H Baddeley, J S Pringle
1Paul Strickland Scanner Centre, Mount Vernon Hospital, Northwood, U.K.
Abstract:
The accuracy of preoperative MRI in detecting tumor extent has been evaluated in 35 patients with primary bone neoplasms; intra-osseous extent was measured on MR images and compared with macroslides of surgical specimens in 26 cases. An almost completely accurate prediction of tumor size was obtained with the combined employment of Spin-Echo (SE) and Short Inversion Time Inversion Recovery (STIR) sequences in the various tumors, with the exception of two Ewing's sarcomas. Changes in Signal Intensity (SI) and tumor morphology were identified in those cases which had undergone presurgical chemotherapy; the reduction in SI and in tumor size or the appearance of a more homogeneous signal was correlated with a positive response to cytotoxic therapy. MR imaging fully satisfies surgeon's preoperative requirements in the assessment of therapy-responding neoplasms as well as in local tumor staging in all types of neoplasms, with the exception of Ewing's sarcoma.
Insights
Preoperative MRI accurately detects bone tumor extent using Spin-Echo (SE) and Short Inversion Time Inversion Recovery (STIR) sequences. It also assesses chemotherapy response by identifying signal intensity and morphology changes in neoplasms.
Area of Science:
- Radiology
- Oncology
- Orthopedic Surgery
Background:
- Accurate preoperative assessment of primary bone neoplasms is crucial for effective surgical planning and treatment.
- Magnetic Resonance Imaging (MRI) is a key modality for evaluating tumor extent, but its accuracy varies.
- Assessing response to neoadjuvant chemotherapy is vital for tailoring treatment in bone tumors.
Purpose of the Study:
- To evaluate the accuracy of preoperative MRI in determining the intra-osseous extent of primary bone neoplasms.
- To assess the utility of MRI in identifying changes indicative of response to presurgical chemotherapy.
- To determine if MRI meets surgeons' preoperative requirements for local tumor staging and therapy response assessment.
Main Methods:
- Retrospective analysis of preoperative MRI scans in 35 patients with primary bone neoplasms.
- Comparison of intra-osseous tumor extent on MRI with surgical specimen macroslides in 26 cases.
- Evaluation of Spin-Echo (SE) and Short Inversion Time Inversion Recovery (STIR) sequences for tumor delineation.
- Analysis of Signal Intensity (SI) and morphological changes in tumors after neoadjuvant chemotherapy.
Main Results:
- Combined SE and STIR sequences achieved high accuracy in predicting tumor size, with exceptions in two Ewing's sarcomas.
- Chemotherapy-induced changes in SI (reduction) and morphology (homogeneity) correlated with positive cytotoxic therapy response.
- MRI accurately assessed local tumor staging and therapy response for most neoplasms, excluding Ewing's sarcoma.
Conclusions:
- Preoperative MRI, particularly with combined SE and STIR sequences, is highly accurate for staging primary bone neoplasms.
- MRI effectively detects chemotherapy-induced changes, aiding in the assessment of treatment response.
- MRI is a valuable tool for surgeons, fulfilling preoperative requirements for staging and response evaluation, except for Ewing's sarcoma.