The aim of this study was to compare ultrasound and MRI dimension measurements for eye tumours and to determine the most suitable measurement modality. MRI and ultrasound yield similar prominence measurements (median absolute difference 0.3 mm) when tumour extent is visible on both modalities. However, in anteriorly located tumours, MRI measurements are more accurate, and using US for these tumours might lead to an underestimation of tumour diameter. MRI provided insight in 3D tumour geometry, even when tumour extent was difficult to visualize on US, enabling more accurate therapy planning and selection for uveal melanoma patients.
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