Computed tomography for visible haematuria – a single nephrographic phase is sufficient for detecting renal cell carcinoma
DOI:
https://doi.org/10.2340/sju.v59.18467Keywords:
Hematuria, Multidetector Computed Tomography, Prospective Study, Renal Cell CarcinomaAbstract
Objectives: No previous studies have compared two computed tomography (CT) protocols in patients presenting with visible haematuria, and most patients undergo a multiphase CT in order to detect upper tract malignancies. We aimed to prospectively compare the diagnostic performance of single- and four-phase CT for detecting renal cell carcinoma (RCC) in patients with visible haematuria.
Materials & methods: ‘A Prospective Trial for Examining Hematuria using Computed Tomography’ (PROTEHCT) was a single-centre prospective paired diagnostic study in patients referred for CT due to painless visible haematuria between September 2019 and June 2021. All patients underwent four-phase CT (control) from which a single nephrographic phase dual energy CT (experimental) was extracted. Both were independently assessed for RCC by randomised radiologists. Histologically verified RCC defined a positive reference standard. Follow-up ascertainment of RCC diagnosis was completed in May 2022. Descriptive statistics were used to calculate the accuracies. Inter-reader agreement was assessed by kappa statistics.
Results: A total of 308 patients (median age, 68 years [interquartile range 53–77, range 18–96], 250 males) were included for analysis. RCC was diagnosed in seven (2.3%) patients during a median follow-up time of 19 months (interquartile range: 15–25). For the control and experimental CT, sensitivity was 100% versus 100%, specificity was 97% versus 98% and accuracy 97% versus 97%. The positive predictive value was 44% versus 50%, and the negative predictive value was 100% versus 100%. The agreement between the control and experimental CT was 98% (k = 0.79).
Conclusion: A single nephrographic phase dual energy CT is sufficient for detecting RCC in patients with visible haematuria.
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Copyright (c) 2024 Kristina Flor Galtung, Peter Mæhre Lauritzen, Gunnar Sandbæk, Dag Bay, Erica Ponzi, Eduard Baco, Nigel Christopher Cowan, Anca Mihaela Naas, Erik Rud
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