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Radiology of diffuse interstitial pulmonary disease in children
1Great Ormond Street Hospital for Children NHS Trust, London, UK. owensc@gosh.nhs.uk
Insights
Pediatric diffuse interstitial lung disease (DILD) presents differently than in adults. Low-dose high-resolution computed tomography (HRCT) improves diagnostic accuracy in children with DILD.
Area of Science:
- Pediatric Pulmonology
- Radiology
- Medical Imaging
Background:
- Diffuse interstitial lung disease (DILD) in children is a complex group of disorders affecting lung development and immune function.
- Pediatric DILD differs significantly from adult forms, making direct extrapolation of findings unsafe.
- Understanding normal pediatric lung growth is crucial for diagnosing DILD in this population.
Purpose of the Study:
- To highlight the unique presentation of DILD in children compared to adults.
- To emphasize the importance of understanding pediatric lung development in DILD diagnosis.
- To evaluate the diagnostic utility of high-resolution computed tomography (HRCT) in pediatric DILD.
Main Methods:
- Review of clinical presentations and disease progression in pediatric DILD.
- Comparison of DILD in children versus adults.
- Assessment of high-resolution computed tomography (HRCT) accuracy for diffuse lung disease diagnosis.
- Evaluation of low-dose HRCT techniques to minimize radiation exposure.
Main Results:
- Pediatric DILD presents with distinct clinical features and progression compared to adult ILD.
- Chest radiography is often non-specific for diagnosing diffuse lung disease in children.
- Low-dose HRCT significantly enhances diagnostic accuracy for pediatric diffuse lung disease.
- Specific low-dose HRCT parameters (50 mA, 0.75 s, 1-mm slices every 15-20 mm) achieve diagnostic accuracy comparable to conventional CT with reduced radiation.
Conclusions:
- DILD in children requires specialized understanding due to differences from adult presentations.
- Low-dose HRCT is a valuable tool for accurate diagnosis of pediatric diffuse lung disease.
- Optimized low-dose HRCT protocols enable effective assessment while managing radiation exposure in pediatric patients.
Abstract:
Diffuse interstitial lung disease (DILD) represents a heterogeneous group of disorders characterised by restrictive lung function and impaired gas exchange. As these diseases occur on a background of the developing lungs and immune system, the clinical presentation and disease progression is modified by comparison with their adult equivalents; thus, often differs markedly in presentation, clinical features and progress from ILD in adults, and it is not safe to extrapolate from adults to children. It is important to understand the normal growth and development of the lungs in children to understand the development of interstitial lung disease. As the chest radiograph is often non-specific, HRCT has been shown in adults and children to increase the accuracy at diagnosis of diffuse lung disease. The trade-off in sensitivity and specificity of HRCT over chest X-ray is related to radiation dose which is significantly higher with conventional spiral or volumetric CT; however, the use of low-dose (50 mA, 0.75 s) limited (1-mm slices every 15-20 mm) HRCT in inspiration with three expiratory supplementary scans allows accurate assessment of the presence and extent of diffuse lung disease at a dose equivalent to approximately ten chest radiographs. Images are reconstructed on a high spatial resolution algorithm and displayed with a wide window setting, at a width of 1500 Hounsfield units (HU) and at a level of -500 HU.