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Updated: Oct 30, 2025

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
Published on: March 6, 2019
Sudden unexpected death in infancy: Severe pulmonary anatomopathological findings in spite of inconsistent clinical
Maria S Pignotti1, Aniello Maiese2, Sara Ugolini1
1Meyer Children Hospital, Florence, Italy.
Abstract:
Respiratory tract infections play a considerable pathogenetic role in many cases of sudden infant death (SID). Frequently, clinicians encounter difficulties in diagnosing the disease because of its often unspecific clinical and radiological presentation. We report three cases of sudden unexpected death in infancy (SUDI), involving two males and one female admitted to hospital due to mild respiratory distress. In all three cases, complete post-mortem investigations were successful in uncovering interstitial lung disease as the cause of death. These cases highlight the key role of infection-related interstitial lung diseases in the pathogenesis of some currently unexplained SUDI/SIDS and the diagnostic difficulties due to the variable clinical and histological pattern, thereby explaining the importance of performing complete post-mortem investigations whenever an infant dies suddenly and unexpectedly.
Insights
Interstitial lung disease, often triggered by respiratory infections, is a key factor in sudden infant death (SID). Complete post-mortem investigations are crucial for diagnosing these challenging cases.
Area of Science:
- Pediatric pathology
- Pulmonary medicine
- Forensic science
Background:
- Respiratory tract infections are implicated in sudden infant death (SID).
- Diagnosing these infections can be challenging due to non-specific clinical and radiological signs.
- Sudden unexpected death in infancy (SUDI) often requires thorough investigation.
Purpose of the Study:
- To investigate the role of interstitial lung disease in unexplained SUDI cases.
- To highlight the diagnostic challenges in identifying infection-related lung disease in infants.
- To emphasize the importance of comprehensive post-mortem examinations.
Main Methods:
- Case study of three infants (two male, one female) presenting with mild respiratory distress.
- Complete post-mortem investigations, including histological examination.
- Analysis of clinical and pathological findings.
Main Results:
- Interstitial lung disease was identified as the cause of death in all three cases.
- The lung disease was linked to infection-related processes.
- Clinical and histological patterns of the disease were variable.
Conclusions:
- Infection-related interstitial lung diseases are significant in unexplained SUDI/SIDS.
- Diagnostic difficulties arise from variable clinical and histological presentations.
- Complete post-mortem investigations are essential for sudden and unexpected infant deaths.
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