Presentation
Left flank colicky pain and hematuria and episodes of vomiting.
Patient Data
Age: 20 years
Gender: Male
From the case:
Ureterolithiasis
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Axial non-contrast

Case Discussion
The case illustrates non-contrast MDCT features of proximal segment ureterolithiasis with upstream hydroureteronephrosis. Calculi are the major cause of ureteric obstruction which in chronic and recurrent cases can lead to chronic renal disease.