Renal pathology remains common throughout childhood. Pediatric Renal Imaging is crucial for accurately diagnosing kidney diseases, utilizing a variety of modalities. Children often present initially at general hospitals; however, those settings may have limited experience with specialised pediatric techniques. Consequently, this review provides a comprehensive overview for general radiologists to standardise practice and identify when speciality referral is necessary.
Furthermore, ultrasound (US) is the sole diagnostic modality required in most cases of childhood renal pathology.The US is the first-line choice because it is non-invasive and highly effective. Similarly, for diagnosing and monitoring mild to moderate renal trauma, US is the appropriate tool. In fact, imaging is not necessary for diagnosing a simple urinary tract infection (UTI), but it is vital for detecting complications and underlying anomalies.
Cystic lesions in children differ from adult presentations, often manifesting as cystic kidney diseases. However, urinary tract dilatation is a frequent finding. Only a minority—up to 30%—require further evaluation to diagnose issues like vesicourinary reflux or urinary tract obstruction.
Selecting the Right Modality in Pediatric Renal Imaging
US remains the primary method for diagnosing urolithiasis in children. Although US is primary, computed tomography (CT) may sometimes be necessary in specific urolithiasis cases. For emergencies, CT is the modality of choice for assessing severe trauma. Conversely, specialists reserve Magnetic Resonance Imaging (MRI) for situations where US is not sufficient. These complex scenarios include congenital anomalies of the kidney and urinary tract (CAKUT) or when evaluating focal lesions. Therefore, general radiologists must understand the indications for these advanced techniques.
When to Refer to a Specialised Paediatric Centre
General hospitals must know the scenarios requiring specialised expertise. Solid renal lesions identified initially on US should always be further evaluated in highly specialised paediatric centres. Moreover, complex cases necessitating MRI, such as those with intricate CAKUT, warrant referral. This review stresses that knowing the normal renal appearance and its variants across all paediatric age groups is essential. This knowledge helps correctly identify pathology and ensures appropriate patient management.
Frequently Asked Questions
Q1: What is the first-line imaging modality for most renal pathologies in children?
Ultrasound (US) serves as the first-line imaging modality for diagnosing the majority of kidney diseases in pediatric patients.
Q2: When is CT reserved in the context of pediatric renal imaging?
CT is reserved for emergencies, such as assessing severe renal trauma, and in selected, non-urgent cases like urolithiasis.
Q3: For which conditions is MRI typically used in children’s renal evaluation?
Doctors use MRI when US is insufficient, particularly for complex congenital anomalies of the kidney and urinary tract or for evaluating focal lesions.
References
- Woźniak MM et al. ESR Essentials: renal imaging in children-practice recommendations by the European Society of Paediatric Radiology. Eur Radiol. 2025 Dec 05. doi: 10.1007/s00330-025-12100-3. PMID: 41348211.
- Rădulescu M et al. Renal Ultrasonography in Children: Principles and Emerging Techniques. Curr Treat Options Pediatr. 2024 Oct 9. doi: 10.1007/s40746-024-00315-3.
- Das U et al. Management of Urinary Tract Infections and Vesicoureteric Reflux: Key Updates from Revised Indian Society of Pediatric Nephrology Guidelines 2023. Indian J Nephrol. 2024;34(1):1.