Abstract
Purpose
To investigate whether multiphasic multidetector computed tomography (MDCT) enhancement can help identify the gain of chromosome 20 in clear cell renal cell carcinomas (RCCs), a rare prognostically significant cytogenetic abnormality.
Methods
With the Institutional Review Board approval, we queried our institution’s pathology database to derive a cohort of 52 cases of clear cell RCC with preoperative four-phase renal mass protocol MDCT and karyotypes of the resected specimens during a 10-year period. Each lesion was evaluated for absolute and relative (compared to contralateral normal renal cortex) attenuations in each phase. Relative attenuation was calculated as [(lesion attenuation − cortex attenuation)/cortex attenuation] × 100. The absolute and relative attenuations were compared using t-tests.
Results
Clear cell RCCs with the gain of 20 had significantly less nephrographic and excretory phase enhancement than clear cell RCCs without the gain of 20 (86.4 HU vs. 111.4 HU, p = 0.007; 70.0 HU vs. 89.4 HU, p = 0.003; respectively). Additionally, the relative nephrographic and excretory phase attenuations of clear cell RCCs with the gain of 20 were significantly less than that of clear cell RCCs without the gain of 20 (−52.7 vs. −34.7, p = 0.002; −44.9 vs. −31.1, p = 0.005; respectively).
Conclusion
Multiphasic MDCT enhancement may assist in identifying the gain of chromosome 20 in clear cell RCCs, if validated in a large prospective trial.
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Jonathan R. Young, MD, Jocelyn A. Young, MD, Daniel J.A. Margolis, MD, Steven Sauk, MD, Allan J. Pantuck, MD, James Sayre, PhD, and Steven S. Raman, MD declare that they have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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The Institutional Review Board waived the requirement of informed consent for this study.
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Young, J.R., Young, J.A., Margolis, D.J. et al. Clear cell renal cell carcinoma: identifying the gain of chromosome 20 on multiphasic MDCT. Abdom Radiol 41, 2175–2181 (2016). https://doi.org/10.1007/s00261-016-0813-9
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DOI: https://doi.org/10.1007/s00261-016-0813-9