Nephrolithiasis and nephrocalcinosis

Stone disease in a child is no longer the rare, exotic diagnosis it once was. Over the past two decades the incidence of paediatric nephrolithiasis has climbed steeply in parallel with adult disease, driven by diet, dehydration, rising obesity and better detection, so that a general paediatrician now sees it regularly. [1] [12] What distinguishes the child from the adult is the obligation to find a cause. A first stone in a child is far more likely than in an adult to reflect an underlying metabolic, anatomical or genetic predisposition, and roughly one in five children with stones carries a single-gene cause. [4] [3] Finding that cause is what prevents recurrence, protects kidney function, and occasionally changes a child's entire trajectory — which is why every paediatric stone deserves a metabolic workup.

This page treats nephrolithiasis and nephrocalcinosis as one subject with two expressions, because they share the same metabolic roots and the same preventive logic. Stones form in the lumen; calcium deposits form in the parenchyma; both arise when urine is supersaturated with calcium, oxalate or phosphate and the inhibitors of crystallisation fall short. [5] [3] The first half of the page is the acute and surgical management of the stone in the ureter; the second half is the metabolic and genetic detective work that stops the next one.

Overview & Definition

Nephrolithiasis is the presence of one or more stones (calculi) in the renal collecting system — the renal pelvis, calyces, ureter or bladder. Urolithiasis is the broader term that encompasses stones anywhere along the urinary tract. The stones themselves are crystalline aggregates of urinary solutes bound by a protein matrix, and their composition reveals the cause: calcium oxalate is the commonest in children as in adults, followed by calcium phosphate, then struvite (infection) stones, uric acid stones and cystine stones. [1] [3]

Nephrocalcinosis is a different but related entity — microscopic or macroscopic deposits of calcium salts within the renal parenchyma itself, in the tubular epithelium and interstitium rather than the lumen. [5] It is classified by location into medullary (by far the commonest, because the medulla is where calcium concentrates), cortical (rare, seen in cortical necrosis or chronic glomerular disease) and diffuse. The distinction matters at the bedside: a stone causes colic and haematuria by obstructing flow, whereas nephrocalcinosis is often an incidental ultrasound finding that points instead to a tubulopathy, a metabolic disorder or prematurity. [5] [6]

The two conditions overlap because they share risk factors. The same hypercalciuria that grows a calcium oxalate stone in the pelvis also seeds the medulla with calcium, so a child can have both at once. The unifying concept is urinary supersaturation — when the concentration of stone-forming solutes exceeds what the urine can keep dissolved, crystals nucleate, grow and either lodge as a stone or deposit in the tissue. [3] [5]

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2. [2]Hu J; Zhang J; Wang J; Tan Y; Zhou L; Xu K Global, Regional, and National Epidemiology of Pediatric Urolithiasis (1990-2021) and 2040 Forecast. J Urol, 2025.PMID 40532191
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9. [9]Soliman MG; El-Gamal O; El-Gamal S; Abdel Raheem A; Abou-Ramadan A; El-Abd A Silodosin versus Tamsulosin as Medical Expulsive Therapy for Children with Lower-Third Ureteric Stones: Prospective Randomised Study. Urol Int, 2021.PMID 33524970
10. [10]Aldaqadossi HA; Shaker H; Saifelnasr M; Gaber M Efficacy and safety of tamsulosin as a medical expulsive therapy for stones in children. Arab J Urol, 2015.PMID 26413330
11. [11]Medairos R; Paloian NJ; Pan A; Moyer A; Ellison JS Risk factors for subsequent stone events in pediatric nephrolithiasis: A multi-institutional analysis. J Pediatr Urol, 2022.PMID 34980558
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