CT of kidney stone disease
Author:
Mikael Häggström [notes 1]
Contents
Planning
- Choice of exam: In the acute setting, ultrasonography for urolithiasis is the optimal first investigation rather than CT.[1]
Evaluation
File:CT measurement of kidney stone in soft tissue and bone window.jpg
Measurement of a 5.6 mm large kidney stone in soft tissue window (width of 400 HU, center at 50 HU) versus skeletal window (W1800,C400). 145 HU is regarded as an appropriate cutoff to distinguish stone from surrounding tissue.[2]
The proper sizing of a stone is most critical at around 5 mm.[note 1]
Notes
- ↑ Ureteric stones less than 5 mm in diameter pass spontaneously in up to 98% of cases, while those measuring 5 to 10 in diameter pass spontaneously in less than 53% of cases.
- Gettman, MT; Segura, JW (2005). "Management of ureteric stones: Issues and controversies ". British Journal of Urology International 95 (Supplement 2): 85–93. doi:. PMID 15720341.
References
- ↑ Smith-Bindman, Rebecca; Aubin, Chandra; Bailitz, John; Bengiamin, Rimon N.; Camargo, Carlos A.; Corbo, Jill; Dean, Anthony J.; Goldstein, Ruth B.; et al. (2014). "Ultrasonography versus Computed Tomography for Suspected Nephrolithiasis ". New England Journal of Medicine 371 (12): 1100–1110. doi:. ISSN 0028-4793.
- ↑ Lidén, Mats; Thunberg, Per; Broxvall, Mathias; Geijer, Håkan (2015). "Two- and three-dimensional CT measurements of urinary calculi length and width: a comparative study ". Acta Radiologica 56 (4): 487–492. doi:. ISSN 0284-1851.
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