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  • Title: [Imaging of sacral chordoma: comparison between MRI and CT].
    Author: Plathow C, Weber MA, Debus J, Kauczor HU.
    Journal: Radiologe; 2005 Jan; 45(1):63-8. PubMed ID: 15662521.
    Abstract:
    AIM: Sacral chordoma is a primarily benign tumor with a high tendency to recur. A correct definition of tumor volume is a significant prognostic factor. We compared the value of CT and MRI in diagnosing a sacral chordoma. METHODS: 31 patients with a histologically proven sacral chordoma were included in this study. Following parameters were analyzed by two independent radiologists: septation, signs of blood and ossification in the tumor tissue, contrast enhancement, maximal tumor diameter, infiltration of the soft tissue, the dural salc and the cauda equina and multifocality. RESULTS: In CT all chordomas showed a hypodensity to the normal tissue and in MRI a hyperintensity on T2w images with a low level of contrast enhancement. On the basis of the more precise soft tissue contrast of MRI compared with CT, MRI was significantly more accurate in all tested parameters (p <0.05) besides in detecting tumor ossification. In CT tumor volume was frequently underestimated. CONCLUSION: MRI in sacral chordoma is an essential tool in the pretherapeutic diagnostic regimen and in a state of relapse.
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