View source for CT in recurrent kidney stone disease

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|author1=[[User:Mikael Häggström|Mikael Häggström]]
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Non-emergent CT in recurrent [[kidney stone disease]]:

==Planning==
*Low-dose CT without intravenous contrast

==Evaluation==
*Locations and sizes of stones. Optionally, stone morphology can be evaluated to give clues about composition.<ref name="TiseliusDaudon2017">{{cite journal|last1=Tiselius|first1=Hans-Göran|last2=Daudon|first2=Michel|last3=Thomas|first3=Kay|last4=Seitz|first4=Christian|title=Metabolic Work-up of Patients with Urolithiasis: Indications and Diagnostic Algorithm|journal=European Urology Focus|volume=3|issue=1|year=2017|pages=62–71|issn=24054569|doi=10.1016/j.euf.2017.03.014}}</ref>
*Any hydronephrosis.
*Any structural abnormalities of the urinary system, such as s tubular ectasia in medullary sponge kidney and nephrocalcinosis.<ref name="TiseliusDaudon2017"/>
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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 (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.<ref name="LidénThunberg2015">{{cite journal|last1=Lidén|first1=Mats|last2=Thunberg|first2=Per|last3=Broxvall|first3=Mathias|last4=Geijer|first4=Håkan|title=Two- and three-dimensional CT measurements of urinary calculi length and width: a comparative study|journal=Acta Radiologica|volume=56|issue=4|year=2015|pages=487–492|issn=0284-1851|doi=10.1177/0284185114528490}}</ref>
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