Metastases and chordoma are both malignant tumors. When the manifestations are not typical, the two are prone to misdiagnosis. DWI using a biexponential model measured ADC, D, D*, and f. DWI using a stretched-exponential model obtained DDC, and α. DKI derived MD and MK. The monoexponential, biexponential, and stretched-exponential models of DWI and DKI have differential diagnostic value for spinal metastases and chordoma. Among the single parameter values, the D value has the highest AUC. Combining the values of three parameters (D, f, and α) can significantly improve the diagnostic efficiency of identifying spinal metastases and chordoma.
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