Abstract
Incidental histopathological findings during medicolegal autopsies provide valuable insights into the underlying health status of individuals who appear clinically healthy during life. Such findings contribute to understanding silent disease burdens in the community. A six-year retrospective study (2016–2021) was conducted at a tertiary care institute in Northeast India, analyzing medicolegal autopsy cases of apparently healthy individuals with no documented chronic illness who died due to unnatural causes. A total of 199 cases with significant incidental histopathological findings were included. Atherosclerosis was the most prevalent incidental finding (41%), followed by pulmonary edema (12%), diffuse alveolar damage (7%), interstitial pneumonitis (6%), and viral hepatitis (5%). The highest frequency of incidental lesions was observed in the 40–60-year age group. Notably, early atherosclerotic changes were identified even in individuals as young as 22 years. Although incidental findings did not contribute to the cause of death, they revealed a substantial burden of asymptomatic pathology in the population. These observations highlight the relevance of autopsy-based surveillance in understanding the epidemiology of silent diseases and their potential public health implications.
Introduction
Medicolegal autopsy remains one of the most powerful tools in forensic medicine, enabling the accurate determination of the cause and manner of death while simultaneously providing essential insights into the health profile of the deceased. Although the primary objective of a post-mortem examination is to investigate unnatural or suspicious deaths, it often reveals unsuspected pathological conditions that were clinically silent during life. 1 Individuals who die suddenly due to road traffic accidents, poisoning, falls, electrocution, or other unnatural events are generally presumed to be healthy prior to death. However, post-mortem examination frequently uncovers significant incidental findings that carry substantial epidemiological and clinical relevance.
The collaborative involvement of the Department of Forensic Medicine and the Department of Pathology is critical in this regard. Gross autopsy findings, when correlated with histopathological examination, help differentiate between lesions directly contributing to death and those that represent underlying but unrelated disease processes. Histopathology, therefore, enhances the precision of medicolegal interpretation, supports accurate certification, and prevents misattribution of cause of death. 2 Moreover, these incidental findings shed light on early, asymptomatic, or undiagnosed disease states that may otherwise remain undetected in the living population.
Understanding such silent pathological changes is important for multiple reasons. First, they provide valuable epidemiological data on the prevalence and age distribution of chronic or progressive diseases such as atherosclerosis, hepatitis, pneumonitis, and cardiomyopathies. Second, they demonstrate the natural progression of diseases that may not have produced symptoms significant enough to seek medical attention. Third, they highlight potential risk factors in specific age groups, especially when early degenerative or inflammatory changes are observed in young individuals. Finally, incidental findings identified during medicolegal autopsies can offer indirect insights into lifestyle, environmental exposures, and public health challenges within a region. 3
The aim of this six-year retrospective study is to analyze the spectrum and frequency of incidental histopathological findings in individuals with no documented chronic illness who died due to unnatural causes. By systematically reviewing these cases, the study aims to identify patterns of asymptomatic pathology, assess their distribution across demographic groups, and explore their broader implications for public health and preventive medicine.
This study highlights the continued importance of post-mortem examination and histopathology in medicolegal practice, not only for resolving medicolegal questions but also for revealing the hidden burden of disease in the community and contributing meaningfully to population-level health understanding.
Materials and Method
Study Design
This retrospective, descriptive cross-sectional study was conducted from January 2016 to December 2021 in the Department of Forensic Medicine and Toxicology, Jawaharlal Nehru Institute of Medical Sciences, a tertiary care institute in Imphal, Manipur, India. The study analyzed incidental histopathological findings observed during medicolegal autopsies performed within the study period.
Sampling and Selection Criteria
All medicolegal autopsies of unnatural deaths brought to the mortuary during the study period were screened. Cases were included or excluded based on the following criteria:
Inclusion Criteria
Autopsy cases demonstrating significant incidental histopathological findings.
Exclusion Criteria
Cases with documented history of non-communicable diseases (NCDs).
Bodies received in advanced decomposition, where histological interpretation was not feasible.
Sample Size
The sample size for this retrospective descriptive cross-sectional study was calculated using the single proportion formula: n = Z²p(1 − p)/d², where Z is the standard normal deviate at 95% confidence (1.96), p is the anticipated proportion of incidental histopathological findings, and d is the absolute precision. In the absence of prior regional data, p was taken as .5 to obtain the maximum sample size, with d set at 0.07. This yielded a minimum required sample size of: n = (1.96)² × 0.5 × 0.5/(0.07)² ≈ 196.
During the study period, 199 medicolegal autopsy cases met the inclusion criteria and were available in the records. All eligible cases were included, thereby satisfying and slightl exceeding the minimum required sample size.
Data Analysis
Histopathological findings from the 199 cases were systematically classified into three major organ systems: cardiovascular, respiratory, and hepatobiliary. Each system was further subcategorized into specific pathological entities. A descriptive approach was used to analyze the data.
Statistical Analysis
Descriptive statistics: Frequency distributions and percentages were calculated to determine the prevalence of each incidental finding.
Trend analysis: Patterns across the six-year study duration were examined.
Software: Statistical analysis and data visualization were performed using SPSS (Statistical Package for the Social Sciences), version 25.0, and Microsoft Excel 2019.
Ethical Considerations
The study was based exclusively on secondary data, with no direct human participation and no use of identifiable personal information. The Institutional Ethics Committee approved the study and granted exemption from full review (IEC No. Ac/03/IEC/JNIMS/2018, dated 09/09/2024), as the research utilized anonymized histopathological records from medicolegal autopsies. All ethical principles, data protection measures, and confidentiality standards were strictly adhered to throughout the study.
Results
Between 2016 and 2021, a total of 217 medicolegal autopsies were submitted for histopathological examination. The majority of the study population belonged to the 41–60 years age group, representing the most prominent demographic segment in the dataset (Table 1). Of the total cases examined, incidental findings were identified in 199 cases, indicating a substantial prevalence of unanticipated pathological conditions detected during post-mortem evaluation.
Age-wise Distribution.
Among the various histopathological observations, the cardiovascular system emerged as the most frequently affected organ system (Table 2). Within this group, atheromatous changes constituted the predominant incidental microscopic finding, reflecting the widespread presence of atherosclerotic pathology in the study population (Tables 3 and 4A). This highlights the significance of silent cardiovascular disease as a major underlying condition in individuals undergoing medicolegal autopsies.
System-wise Distribution of Cases.
Top Incidental Histopathological Findings.
System-wise Incidental Findings.
The respiratory system accounted for the next highest frequency of incidental findings (Table 4B). Key observations included pulmonary edema, diffuse alveolar damage, and interstitial pneumonia, conditions that may be associated with underlying systemic illness, acute physiological stress, or respiratory compromise preceding death.
The hepatobiliary system also revealed notable histopathological alterations (Table 4C). These included early cirrhotic changes and viral hepatitis, suggesting the presence of chronic liver disease and infectious processes that, while not directly responsible for death, may have contributed to overall health deterioration.
Overall, this study provides important insights into the prevalence and spectrum of incidental histopathological findings detected during medicolegal autopsies. The results emphasize the presence of silent or subclinical diseases across major organ systems and underscore the value of post-mortem histopathology in unveiling hidden contributors to morbidity and mortality.
Discussion
This retrospective study was conducted to evaluate histopathological findings in medicolegal autopsies, with a specific focus on identifying previously undiagnosed medical conditions. While similar case-based studies have been reported in India by authors such as Patel SH et al. 4 and Vivek K et al., 5 the larger sample size and broader scope of the present study offer valuable insight into the silent burden of disease across diverse populations.
Age and Demographic Analysis
Individuals in the 41–60 years age group constituted the most affected demographic, consistent with observations by Arunlatha P et al. 6 (2017) and Jhaji et al. 7 (2013). This age range represents a transitional phase wherein cumulative exposure to lifestyle, environmental, and occupational risk factors begins to manifest clinically. The predominance of incidental findings in this group underscores the need for targeted preventive strategies and early screening programs to mitigate undiagnosed health conditions in middle-aged individuals.
Cardiovascular System Findings
The cardiovascular system was the most commonly affected organ system, with atherosclerosis emerging as the predominant incidental finding. Similar findings have been documented by Arunalatha P et al., 6 Sulegaon R et al., 8 Patel S et al., 9 and Puri A et al., 10 reflecting the widespread prevalence of subclinical cardiovascular disease. Globally, cardiovascular diseases account for 17.9 million deaths annually, representing 32% of all deaths, with 85% attributed to heart-related conditions. 11 Particularly concerning is the detection of atherosclerotic changes in individuals as young as 22 years, indicating an emerging trend of early onset vascular pathology. These findings call for further investigation to determine the potential link between early atherosclerotic lesions and catastrophic events such as sudden cardiac death in younger age groups, and highlight the pressing need for preventive screening and lifestyle interventions.
Respiratory System Findings
Within the respiratory system, pulmonary edema was the most common incidental finding, with a prevalence of 36.9%, significantly higher than the 12.37% to 17% reported by Arunalatha P et al., 6 Patel S et al., 9 and Puri A et al. 10 This marked increase may reflect evolving environmental influences, particularly rising air pollution levels, which have become a major public health concern. Interstitial pneumonitis, the second-most prevalent incidental finding at 18.4%, may similarly be associated with deteriorating environmental conditions in the region. 11 Singh et al. 12 and Selvam et al. 13 also highlighted the relationship between respiratory pathology and environmental factors. These observations reinforce the need for stronger public health measures to address air quality, including policy enforcement and community-level awareness initiatives.
Hepatobiliary System Findings
In the hepatobiliary system, viral hepatitis was the most frequent incidental finding, accounting for 43.4% of cases. This high prevalence may be related to silent hepatic infections, particularly among intravenous drug users (IDUs) in the state. 14 Given the asymptomatic nature of chronic hepatitis and its potential progression to cirrhosis and hepatocellular carcinoma, these findings highlight the importance of rigorous screening and early detection. Public health interventions must also address social vulnerabilities and healthcare gaps that contribute to the spread of viral hepatitis among high-risk populations.
Implications and Way Forward
The findings of this study emphasize the considerable burden of silent disease that often remains undetected during life. The incidental lesions identified in this study highlight the need for proactive, preventive health strategies, including routine screening, lifestyle modification, and early intervention. Moreover, the results draw attention to broader environmental, societal, and systemic determinants of health, calling for coordinated, multi-sectoral approaches to improving population health.
By correlating incidental findings with existing literature, this study strengthens the link between forensic pathology and public health, underscoring the importance of histopathological evaluation in revealing hidden disease patterns. Future large-scale studies and interdisciplinary collaboration will be essential to further explore these findings and develop effective strategies to address the health challenges identified.
Conclusion
This autopsy-based study demonstrates that, although incidental findings may not contribute directly to the cause of death, they provide valuable insight into the epidemiology of various diseases, including asymptomatic conditions prevalent in the region. Such information is crucial for health policy-makers in planning effective screening and prevention programs. The study also highlights several unexpected and rare incidental findings encountered during medicolegal autopsies.
Histopathological examination of autopsy specimens plays an essential role in refining diagnostic strategies and guiding appropriate clinical management to reduce morbidity and mortality in tertiary care settings. These findings reinforce the importance of regular health check-ups and the adoption of healthy lifestyle practices for all individuals, regardless of their perceived health status.
Footnotes
Declaration of Conflicting Interests
The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Ethical Approval
The study was based exclusively on secondary data, with no direct human participation and no use of identifiable personal information. The Institutional Ethics Committee approved the study and granted exemption from full review (IEC No. Ac/03/IEC/JNIMS/2018, dated 09/09/2024), as the research utilized anonymized histopathological records from medico-legal autopsies. All ethical principles, data protection measures, and confidentiality standards were strictly adhered to throughout the study.
Funding
The authors received no financial support for the research, authorship, and/or publication of this article.
Informed Consent
As this is a retrospective, record based study, and all the identifiable information have been de-linked from the study data, we requested and obtained a wavier of informed consent for this study.
