A case of diffuse kidney hyperechogenicity in early childhood associated with biallelic PKHD1 variants

• Published in: Pediatric nephrology (Berlin, West) Vol. 39; no. 9; pp. 2633 - 2636
• Main Authors: Krall, Paola, Faundes, Víctor, Gálvez, Carla, Cavagnaro, Felipe
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2024; Springer Nature B.V
• Subjects: Calcinosis; Children; Clinical Insights; Diagnosis; Female; Genetic analysis; Humans; Infant; Kidney - abnormalities; Kidney - diagnostic imaging; Kidney - pathology; Kidney diseases; Kidneys; Medicine; Medicine & Public Health; Mutation; Neonates; Nephrocalcinosis - diagnosis; Nephrocalcinosis - diagnostic imaging; Nephrocalcinosis - genetics; Nephrolithiasis; Nephrology; Neuroimaging; Pediatrics; Prognosis; Receptors, Cell Surface - genetics; Renal cortex; Renal failure; Ultrasonography - methods; Urology; Nephrocalcinosis; Medullary sponge kidney; Genetic counseling; Mimicking phenotype; PKHD1
• ISSN: 0931-041X; 1432-198X; 1432-198X
• DOI: 10.1007/s00467-024-06348-y

Background Nephrocalcinosis (NC) is characterized by an excessive accumulation of calcium deposits in the kidneys. In children, it is often incidentally discovered with an uncertain prognosis. Case-diagnosis/treatment A 3-month-old girl suspected to have a milk protein allergy underwent an ultrasound that revealed increased echogenicity in the kidney pyramids suggestive of medullary NC. At the age of 18 months, imaging findings revealed not only hyperechogenicity in the medulla but also in the cortex. Over the course of a long follow-up, her kidneys maintained size within the upper limits but showed an increase by age 7. Genetic analysis identified PKHD1 variants, which required structural predictive tools to guide clinical diagnosis. Until the age of 7, her kidney function has remained intact; however, her prognosis is uncertain. Conclusions NC in newborns is a rare condition, but its incidence is rising. Recurrent urinary infections or kidney stones may lead to kidney failure. A proactive approach in sporadic NC enables an early diagnosis to orientate clinical supervision and facilitates counseling to support family planning decisions.