CT in recurrent kidney stone disease

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Author: Mikael Häggström [notes 1]

Planning

  • Low-dose CT without intravenous contrast

Evaluation

  • Locations and sizes of stones. Optionally, stone morphology may give clues about composition.
  • Any hydronephrosis.
  • Any structural abnormalities of the urinary system, such as s tubular ectasia in medullary sponge kidney and

nephrocalcinosis.

  • Measurement of a 5.6 mm large kidney stone in soft tissue window (at left, with width of 400 HU, and center at 50 HU) versus skeletal window (right, W1800,C400). 145 HU is regarded as an appropriate cutoff to distinguish a stone from surrounding tissue.[1]

Notes

  1. ↑ For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.

References

  1. ↑ 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:10.1177/0284185114528490. ISSN 0284-1851. 
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