General Information About Ureteral Stones
Disease Details and Frequently Asked Questions
It occurs when solid crystalline masses (stones), formed by the aggregation of filtered urinary minerals within the kidney, dislodge and become impacted in the ureter—the very narrow, delicate tube connecting the kidney to the urinary bladder.
The internal diameter of the ureter is merely a few millimeters. When a stone obstructs this narrow passage, the downward flow of urine is blocked, causing a retrograde pressure backup into the kidney. The kidney subsequently begins to swell (hydronephrosis) and stretch its surrounding capsule. This rapid capsular distension intensely stimulates the capsular nerves, precipitating one of the most agonizing, knife-like pains known in medicine, termed 'Renal Colic'—often compared by female patients to the severity of childbirth labor pains.
The most pathognomonic symptom is a severe, waxing and waning (colicky) pain originating in the right or left flank (lower back) and radiating downwards to the groin and genitalia (the testicles in men or labia in women). Because the stretching of the kidney stimulates the autonomic nervous system, it is frequently accompanied by profound nausea, forceful vomiting, a constant urge to urinate, and visible or microscopic blood in the urine (hematuria).
If the stone's transverse diameter is smaller than 5-6 millimeters (0.5 cm), there is a high probability of spontaneous passage within 1-2 weeks, facilitated by aggressive hydration (drinking plenty of water), physical activity, and medical expulsive therapy utilizing alpha-blocker medications (prostate pills) to dilate the distal ureter. Conversely, stones exceeding 7-8 mm in diameter typically remain impacted in the canal and require urological intervention.
The Gold Standard diagnostic modality in the emergency department or outpatient setting is the Non-Contrast Computed Tomography (NCCT) scan of the abdomen and pelvis. The CT scan delineates with 100% precision the exact anatomical location of the impaction, the precise millimeter dimensions of the calculus, the degree of resultant renal swelling (hydronephrosis), and the specific density (Hounsfield units) of the stone.
If the stone fails to pass spontaneously, medical intervention becomes mandatory to prevent the risk of irreversible renal parenchymal damage and life-threatening systemic infection (urosepsis).
URS (Ureteroscopy): This is the most frequently performed contemporary minimally invasive surgical procedure. Under anesthesia, without any external surgical incisions or punctures, a highly flexible, ultra-thin fiber-optic camera is advanced via the natural urinary orifice (urethra) up into the ureter to visualize the stone directly. The calculus is then fragmented into fine, sand-like dust utilizing a Holmium Laser, and the larger fragments are extracted using specialized tipless nitinol stone baskets. The patient is typically discharged on the same day, stone-free and completely relieved of pain.
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