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Sudden infant death syndrome (SIDS) "gray zone" or borderline cases are those in which it is challenging to define whether the pathological findings are sufficiently severe to lead to death. We report a case of a 17-day old male newborn who came to our attention for unexplained death. A complete autopsy was performed, including close examination of the cardiac conduction system. Lungs presented diffuse alveolar damage and interstitial inflammation, the cardiac conduction system showed fetal dispersion, resorptive degeneration, junctional tissue islands and cartilaginous hypermetaplasia of the central fibrous body. The final cause of death was a "gray zone" SIDS. This case report will highlight the intersection of SIDS and pneumonia in newborns, exploring the challenges and controversies surrounding the diagnosis and management of this complex condition., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)