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Bladder tumour staging: comparison of diffusion- and T2-weighted MR imaging

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Abstract

The aim of this work was to evaluate the clinical feasibility of diffusion-weighted (DW) MRI in detection and staging of urinary bladder tumour and to compare DW MRI with the T2-weighted technique. One hundred and six patients with bladder tumour were prospectively included in our study. All patients were evaluated with MR imaging. We started with axial T2-weighted high resolution MR of the urinary bladder, then DW MRI. Two radiologists independently interpreted the MR images, and discrepancies were resolved by consensus. The accuracy of DW MRI in staging of bladder tumour was evaluated using the final histopathological findings. In DW imaging (DWI) staging accuracy was 63.6% and 69.6% in differentiating superficial from invasive tumours and organ-confined from non-organ-confined tumours, respectively. On a stage by a stage basis, DWI accuracy was 63.6% (21/33), 75.7% (25/33), 93.7% (30/32) and 87.5% (7/8) for stages T1, T2, T3 and T4, respectively. In the T2-weighted technique, the overall staging accuracy was only 39.6% and accuracy for differentiating superficial from invasive tumours and organ-confined from non-organ-confined tumours was 6.1% and 15.1%, respectively. DW is superior to T2-weighted MRI in staging of organ-confined tumours (≤T2) and both techniques are comparable in the evaluation of higher-stage tumours.

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Authors and Affiliations

  1. Department of Urology, Urology & Nephrology Center, Mansoura University, Mansoura, Egypt

    Ahmed El-Assmy, Ahmed Mosbah, Ahmed R. El-Nahas, Ihab A. Hekal & El Housseiny Ibrahiem

  2. Department of Radiology, Urology & Nephrology Center, Mansoura University, Mansoura, Egypt

    Ahmed El-Assmy, Mohamed E. Abou-El-Ghar, Huda F. Refaie & Tarek El-Diasty

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  1. Ahmed El-Assmy
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  2. Mohamed E. Abou-El-Ghar
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  3. Ahmed Mosbah
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  4. Ahmed R. El-Nahas
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  5. Huda F. Refaie
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  6. Ihab A. Hekal
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  8. El Housseiny Ibrahiem
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Correspondence to Ahmed El-Assmy.

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El-Assmy, A., Abou-El-Ghar, M.E., Mosbah, A. et al. Bladder tumour staging: comparison of diffusion- and T2-weighted MR imaging. Eur Radiol 19, 1575–1581 (2009). https://doi.org/10.1007/s00330-009-1340-7

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  • DOI: https://doi.org/10.1007/s00330-009-1340-7

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