Residency · Residency · Pathology
The Hospital Autopsy: Technique and Clinicopathologic Correlation
Introduction
The hospital (clinical) autopsy remains a vital tool for quality assurance, medical education, and advancing clinical knowledge. Despite declining autopsy rates, the procedure continues to reveal significant diagnostic discrepancies in 10-30% of cases and provides invaluable teaching material for pathology trainees and clinicians alike.
Indications and Consent
Reasons for Hospital Autopsy
Hospital autopsies serve many purposes: discovery of missed diagnoses and evaluation of diagnostic accuracy, assessment of therapeutic efficacy and complications of treatment, quality assurance and patient safety improvement, education of trainees in pathology, medicine, and surgery, epidemiologic surveillance and public health, family closure and genetic counseling implications for surviving relatives, and research including tissue banking for future studies.
Consent and Authorization
Hospital autopsies require informed consent from the legal next of kin. Consent may be full (unrestricted) or limited (restricted to specific cavities or organs). Religious and cultural considerations should be discussed sensitively. The requesting clinician plays a key role in discussing the value of autopsy with the family. Medicolegal (forensic) autopsies do not require family consent, with jurisdiction determined by the medical examiner or coroner.
External Examination
Systematic Approach
The external examination documents patient identification, height, weight, body habitus, and nutritional status. All surgical scars, wounds, drains, catheters, and medical devices are noted in situ. Skin findings such as jaundice, cyanosis, edema, petechiae, rashes, and pressure injuries are described. The eyes are examined for icterus and petechiae, and the oral cavity and external genitalia are inspected. Significant findings are photographed, and prostheses and implants are documented. Radiographs may be obtained if clinically indicated.
Internal Examination
Evisceration Techniques
Several evisceration techniques are available. The Rokitansky method removes organs en bloc, allowing examination of anatomic relationships. The Virchow method removes organs individually. The Letulle method involves complete en bloc evisceration from cervical through pelvic organs as a single block. Most practitioners use a modified Rokitansky technique with organ block removal by system. A standard Y-incision or midline incision from chin to pubis provides access.
Thoracic Cavity
The thoracic examination assesses for pleural effusions (with volume measured and character noted), and the lungs are examined in situ for consolidation, atelectasis, and embolism. The heart examination begins with intact weighing, followed by assessment of the pericardium, epicardial fat, coronary arteries (cross-sections at 3-mm intervals), valves, chambers, and myocardium. The great vessels, including the aorta, are opened longitudinally to note atherosclerosis, dissection, or aneurysm.
Abdominal and Pelvic Cavity
Ascites volume and character are noted. The liver is weighed and serially sectioned at 1-cm intervals, noting cirrhosis, mass lesions, and congestion. The spleen, kidneys, adrenals, and pancreas are weighed and sectioned systematically. The GI tract is opened along the antimesenteric border to examine the mucosa. Pelvic organs including the uterus, ovaries, prostate, and bladder are examined with attention to the clinical history.
Brain Examination
The brain may be examined fresh immediately (with limited sectioning) or fixed in 10% formalin for 2-3 weeks before full examination. The external examination covers the meninges, cerebral convexities, circle of Willis, brain stem, and cerebellum. Serial coronal sections through the cerebral hemispheres are made at 1-cm intervals, with axial sections through the brainstem and sagittal sections through the cerebellum. The spinal cord is removed via an anterior or posterior approach and sectioned at multiple levels.
Histologic Sampling
Standard sections include the heart (LV, RV, septum, and SA node region), lungs (all lobes), liver, kidneys, spleen, pancreas, adrenals, thyroid, and brain (representative sections). Additional sections are targeted by gross findings and clinical questions. Special stains and immunohistochemistry are used as indicated (such as Congo red for amyloid and AFB stains for TB). Tissue for ancillary studies including microbiology cultures, toxicology, electron microscopy, molecular testing, and metabolic studies should be saved.
Clinicopathologic Correlation
The Autopsy Report
Provisional anatomic diagnoses are communicated to clinicians within 24-48 hours as a preliminary report. The final report includes the gross description, microscopic findings, and clinicopathologic correlation. Diagnoses are listed in order of clinical significance, with the cause of death and contributing conditions identified. Autopsy findings are correlated with clinical history, imaging, and laboratory data. Major discrepancies are classified using the Goldman system: Class I indicates a missed diagnosis that would have changed management, and Class II indicates a missed diagnosis unlikely to have changed the outcome.
| Goldman Class | Definition | Example |
|---|---|---|
| Class I | Missed major diagnosis; would have changed management and potentially outcome | Unsuspected pulmonary embolism, treatable infection |
| Class II | Missed major diagnosis; would not have changed outcome | Occult malignancy in a terminal patient |
| Class III | Missed minor diagnosis related to terminal disease | Minor secondary finding |
| Class IV | Missed minor diagnosis unrelated to cause of death | Incidental finding |
Quality and Discrepancy Analysis
Studies consistently show major diagnostic discrepancies in 10-30% of autopsies. Common missed diagnoses include pulmonary embolism, myocardial infarction, infections (especially fungal), and malignancy. Autopsy findings should be shared with the clinical team at morbidity and mortality conferences, and a database of findings supports institutional quality improvement.
Special Techniques
Infectious Disease Autopsies
Universal precautions apply to all autopsies, with enhanced precautions for known high-risk pathogens. BSL-3 practices are required for suspected tuberculosis, prion disease, and viral hemorrhagic fevers. Cultures are obtained from blood, lung, spleen, CSF, and other relevant sites under sterile technique. Prion disease requires specialized protocols: brain should not undergo formalin fixation until after prion testing, and disposable instruments should be used.
Perinatal and Fetal Autopsies
Perinatal autopsies include a detailed external examination with measurements and photographs. Organ weights are compared to gestational age-specific normal values. The placenta, membranes, and umbilical cord are examined as an integral part of the autopsy. Radiographs (babygram) are essential, and karyotype and metabolic studies are obtained as indicated.
Minimally Invasive Autopsy
Post-mortem CT/MRI combined with needle biopsies is increasingly used when families decline conventional autopsy. This approach provides good detection of major findings but is limited for microscopic diagnoses. Virtopsy refers to a comprehensive post-mortem imaging protocol.
Clinical Pearls
Major diagnostic discrepancies discovered at autopsy occur in 10-30% of cases, underscoring the continued relevance of the hospital autopsy for quality assurance. The autopsy report should be structured to clearly identify the cause of death, contributing conditions, and clinicopathologic correlations, with preliminary findings communicated within 24-48 hours. Fresh tissue should be saved at the time of autopsy for potential ancillary studies including microbiology, molecular testing, and electron microscopy. Engaging clinicians in requesting autopsies and reviewing findings at interdisciplinary conferences is essential to maximizing the educational and quality improvement value of the procedure.
References
- Shojania KG, et al. Changes in rates of autopsy-detected diagnostic errors over time: a systematic review. JAMA. 2003;289(21):2849-2856.
- Goldman L, et al. The value of the autopsy in three medical eras. N Engl J Med. 1983;308(17):1000-1005.
- The Royal College of Pathologists. Guidelines on Autopsy Practice. 2020.
- Burton JL, Underwood J. Clinical, educational, and epidemiological value of autopsy. Lancet. 2007;369(9571):1471-1480.