Dynamic contrast-enhanced MR imaging for differentiation between enchondroma and chondrosarcoma.

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Distinguishing benign enchondromas from low-grade chondrosarcoma (CS) is crucial for appropriate patient management.
• Standard MRI has limitations in accurately differentiating these cartilaginous tumors.
• Dynamic contrast-enhanced MRI (DCE-MRI) offers potential for improved diagnostic accuracy.

Purpose of the Study:

• To evaluate the efficacy of DCE-MRI in differentiating benign cartilage tumors (enchondromas) from malignant ones (CS) compared to standard MRI.
• To establish a cutoff value using DCE-MRI parameters to accurately differentiate enchondroma from low-grade CS.

Main Methods:

• A retrospective study included 106 patients: 75 with enchondromas and 31 with CS.
• Tumors were evaluated using standard MRI and DCE-MRI, including region-of-interest (ROI) analysis for vascularization and perfusion.
• A subgroup analysis focused on tumors arising in long bones.

Main Results:

• A cutoff value of relative enhancement = 2 and slope = 4.5 achieved 100% sensitivity for detecting CS, with 63.3% specificity.
• DCE-MRI demonstrated 93.4% accuracy in predicting CS diagnosis.
• The diagnostic accuracy of standard MRI parameters was comparable to DCE-MRI parameters.

Conclusions:

• Both standard MRI and DCE-MRI are important and complementary tools for differentiating enchondroma from low-grade CS.
• A combined approach utilizing both standard MRI and DCE-MRI yields the highest diagnostic accuracy for cartilaginous tumors.
• DCE-MRI provides valuable information for differentiating benign from malignant cartilage tumors.