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Typical technetium dimercaptosuccinic acid distribution patterns in acute pyelonephritis
Insights
Technetium dimercaptosuccinic acid (DMSA) renal scintiscans reveal significant uptake abnormalities in most children with acute pyelonephritis. Follow-up scans show persistent pathology, highlighting the importance of imaging in diagnosing and monitoring pediatric kidney infections.
Area of Science:
- Pediatric Nephrology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Acute pyelonephritis is a common serious bacterial infection in children.
- Renal scarring can result from pyelonephritis, potentially leading to long-term complications.
- Technetium dimercaptosuccinic acid (DMSA) scintigraphy is a key imaging modality for evaluating pediatric pyelonephritis.
Purpose of the Study:
- To analyze DMSA scintigraphy findings in children diagnosed with acute pyelonephritis.
- To identify characteristic patterns of renal uptake abnormalities.
- To assess the persistence of scintigraphic abnormalities on follow-up imaging.
Main Methods:
- Retrospective review of 37 children with clinical acute pyelonephritis.
- Analysis of initial and follow-up DMSA renal scintiscans (18 children).
- Categorization of pathological uptake patterns and assessment of parenchymal changes.
Main Results:
- 89% of children showed uptake abnormalities on initial DMSA scans (74% of kidneys).
- Common patterns included pole defects (60%) and scattered defects (21%).
- 52% of kidneys had remaining pathology at follow-up; vesicoureteric reflux was present in 33% without significant correlation to parenchymal changes.
Conclusions:
- DMSA scintigraphy is highly sensitive in detecting acute pyelonephritis-related renal abnormalities in children.
- Characteristic uptake patterns can be identified, aiding diagnosis.
- Persistent renal pathology is common, underscoring the need for follow-up imaging and management strategies.
Abstract:
Technetium dimercaptosuccinic acid renal scintiscans in 37 children with clinical diagnosis of acute pyelonephritis were reviewed. In 18 children, follow-up scintigraphy was obtained after an interval ranging from 5 to 8 months. Uptake abnormalities were found in 89% of the children (74% of the kidneys). We were able to identify four typical pathological uptake patterns: (i) pole defect(s), usually wedge shaped (60%); (ii) lateral wedge shaped defect (4%); (ii) scattered multiple defects (21%); and (iv) swollen kidney without areas of diminished uptake (15%). Remaining pathology at follow-up was found in 52% of the kidneys. Vesicoureteric reflux was present in 33% of the children with scintigraphic signs of pyelonephritis. Frequencies of parenchymal changes in the acute phase and at follow-up were not significantly correlated to the presence of reflux.