Measurement of ureteric stones by CT in the axial plane underestimates maximal stone diameter compared with measurement in the coronal reconstruction plane, according to a study of 331 patients with ureteric colic who had unenhanced multidetector CT scans. Overall, underestimation was 20% compared with axial plane measurement, whereas for stones that passed spontaneously or with medical expulsive therapy, a 17% underestimation was seen.
References
Nazim, S. M. et al. Measurement of ureteric stone diameter in different planes on multidetector computed tomography—impact on the clinical decision making. Urology 10.1016/j.urology.2013.09.037
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Stone size measurement depends on CT plane. Nat Rev Urol 11, 64 (2014). https://doi.org/10.1038/nrurol.2013.310
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DOI: https://doi.org/10.1038/nrurol.2013.310