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Letter to the Editor| Volume 169, P275, November 2022

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      We have read the thoughtful reply to our study by Borgbjerg et al.
      • Kim SSY
      • Breau R
      • Mallick R
      • et al.
      Ultrasound correlates highly with cross sectional imaging for small renal masses in a contemporary cohort.
      In this letter, Borgbjerg et al present methodological concerns regarding the limitation of correlation analysis in assessing the interchangeability of US and CT/MRI as measurement methods for small renal masses (SRMs).
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      References

        • Kim SSY
        • Breau R
        • Mallick R
        • et al.
        Ultrasound correlates highly with cross sectional imaging for small renal masses in a contemporary cohort.
        Urology. 2022; https://doi.org/10.1016/j.urology.2022.02.020
        • Mucksavage P
        • Ramchandani P
        • Malkowicz SB
        • et al.
        Is ultrasound imaging inferior to computed tomography or magnetic resonance imaging in evaluating renal mass size?.
        Urology. 2012; 79: 28-31https://doi.org/10.1016/j.urology.2011.09.036
        • Mucksavage P
        • Kutikov A
        • Magerfleisch L
        • et al.
        Comparison of radiographical imaging modalities for measuring the diameter of renal masses: is there a sizeable difference?.
        BJU Int. 2011; 108: E232-E236https://doi.org/10.1111/j.1464-410X.2010.09977
        • Doğan Özgür
        • Bland-Altman N
        Analysis: a paradigm to understand correlation and agreement.
        Turkish J Emerg Med. 2018; 18: 139-141https://doi.org/10.1016/j.tjem.2018.09.001
        • Liaw CW
        • Winoker JS
        • Mehrazin R
        Imaging protocols for active surveillance in renal cell carcinoma.
        Curr Urol Rep. 2018; 19: 81https://doi.org/10.1007/s11934-018-0830-z

      Linked Article

      • “Re: Ultrasound Correlates Highly With Cross Sectional Imaging for Small Renal Masses in a Contemporary Cohort”
        UrologyVol. 169
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          We have read the study by Soe et al entitled “Ultrasound Correlates Highly With Cross Sectional Imaging for Small Renal Masses in a Contemporary Cohort” with interest.1 Active surveillance (AS) of small renal masses (SRMs) has recently gained acceptance as a valid management option. Consequently, the radiation dose is a cause of increased concern,2 and studies investigating dose reduction strategies are urgently needed. AS mandates accurate radiographic measurements, and as cited by the authors, the most common imaging metrics prompting cross-over from an AS protocol to delayed intervention are linear tumor growth rate (maximum diameter > 0.5 cm/y) and size > 4 cm.
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