Acute pancreatitis, hypercalcemia, and kidney stones: True incidence or unveiled prevalence?

Table 1 Acute factors during pancreatitis that may favor crystalluria without proving de novo stone formation

Metabolic factor	Likely acute effect	Interpretive implication
Intravascular volume depletion	Urine becomes concentrated, and supersaturation rises	Transient crystalluria may increase without establishing a new stable stone
Hypocitraturia or reduced inhibitors	Protective buffering against crystal aggregation decreases	Aggregation may be facilitated, but organized calculi still require time and retention
Transient hypercalcemia	Possible short-term increase in urinary calcium excretion if sustained	Serum calcium alone is insufficient evidence for stone causation without urine data
Inflammatory epithelial stress	Crystal adhesion and urothelial interaction may be altered	Acute illness may unmask a pre-existing crystal burden rather than generate a new calculus
Serial ultrasonography during recovery	Visibility of tiny echogenic foci may change with operator, body habitus, and acoustic windows	Apparent incidence may reflect detection bias instead of true lithogenesis

Table 2 Distinguishing true incident nephrolithiasis from unveiled prevalent microlithiasis in acute pancreatitis

Domain	True incident nephrolithiasis	Unveiled prevalent microlithiasis
Biological premise	New crystal nucleation, aggregation, retention, and growth produce a genuinely new stone	Previously silent crystals or microliths become detectable during acute evaluation
Expected time course	Usually, weeks to months before a clinically meaningful calculus becomes evident	Detection may shift from hours to days without implying new stone formation
Baseline imaging expectation	No renal deposit should be present on high-quality baseline computed tomography	Small pre-existing deposits may be missed on ultrasound, yet still be present at baseline
Urinary evidence needed	Persistent lithogenic profile on 24-hour urine supports causal inference	Acute metabolic disturbance may transiently increase visibility without proving chronic stone disease
Short-term behavior	Lesion persists or enlarges on follow-up imaging	Focus may regress after hydration and recovery from inflammatory-metabolic stress
Clinical implication	Long-term stone prevention and metabolic evaluation are usually warranted	Repeat post-recovery assessment is needed before labeling chronic nephrolithiasis