Alerts and Notices
SynopsisUreteral calculi are stones that have formed in the kidney and passed from the renal collecting system into the ureter. For a more detailed discussion on the demographics, etiology and pathophysiology, and clinical associations of nephrolithiasis, please see renal calculus.
While many stones located within the renal pelvis are discovered incidentally on radiographic or sonographic imaging, most stones that have passed into the ureter and are of significant size cause renal colic. Renal colic is sudden-onset flank pain radiating to the groin, accompanied by nausea and vomiting. This colicky pain typically waxes over the course of 15-30 minutes and becomes steady, unrelenting, and unbearable. Patients may experience worsening paroxysms of pain lasting 20-60 minutes as the stone courses downward through the ureter and as the ureter spasms.
If the stone's descent is arrested at the ureterovesical junction, patients may experience urinary frequency, dysuria, and urgency and are predisposed to the development of urinary tract infections both from the stone forming as a nidus for bacterial growth and from the mechanical urothelial trauma caused by the stone's movement. Most individuals with nephrolithiasis will also develop hematuria, particularly when passing a stone.
Pain from nephrolithiasis is thought to primarily be the result of renal capsular distention and varies depending on the location of the stone and the degree of obstruction caused by the stone. Stones that occlude the upper ureter or ureteropelvic junction invariably cause significant flank pain that is accompanied by severe costovertebral angle tenderness to palpation. As the innervation of the testicle is shared with the kidney, patients often describe radiation to the testicles or labia. When stones pass into the bladder, patients usually experience swift resolution of their pain.
N20.1 – Calculus of ureter
31054009 – Ureteric stone
Differential Diagnosis & PitfallsFlank pain with or without hematuria:
- Pyelonephritis – Fever uncommon in uncomplicated nephrolithiasis.
- Loin pain-hematuria syndrome
- Renal cell carcinoma
- Ectopic pregnancy – Beta human chorionic gonadotropin (beta-hCG) should be checked in any woman who has a possibility of pregnancy.
- Testicular tumors (see testicular cancer)
- Ovarian torsion or rupture
- Biliary colic and cholecystitis – Hematuria is not a feature of these diseases.
- Mesenteric ischemia – Hematuria is not a feature of this disease.
- Opioid use disorder – Patients may feign the symptoms of nephrolithiasis in order to obtain narcotics.
- Renal arteriovenous malformation
- Herpes zoster – Overlying skin changes will be apparent. Pain is typically burning in quality, constant, and remains in a dermatomal distribution.
Drug Reaction DataBelow is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.