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Accuracy of frozen-section diagnosis in a teaching hospital
Abstract:
A retrospective quality assurance study of frozen-section diagnoses was performed to determine the source and nature of inaccuracies associated with this procedure over an 18-month period in a large teaching hospital. Of 30,278 surgical pathology specimens accessioned, 1414 (4.7%) had frozen-section examination. Of these, there were five false-positive diagnoses of malignancy (0.4%), 16 false-negative diagnoses of malignancy (1.1%), and 53 deferrals of diagnosis (3.7%). Soft-tissue, breast, and lymph node sites accounted for 12 errors (57%), while central nervous system, breast, and soft-tissue sites were associated with 30 deferrals (57%). Erroneous frozen-section diagnoses were attributed to interpretation (57%), microscopic sampling (24%), gross sampling (9.5%), and lack of communication between pathologist and surgeon (9.5%). Some of these diagnostic errors might have been avoided by changes in procedure or technique.
Insights
Frozen-section diagnoses are generally accurate, but errors in interpretation and sampling can occur. Improving pathologist-surgeon communication and refining techniques may reduce diagnostic inaccuracies in surgical pathology.
Area of Science:
- Pathology
- Surgical Pathology
- Quality Assurance
Background:
- Frozen-section examination is a critical intraoperative diagnostic tool.
- Ensuring the accuracy of frozen-section diagnoses is vital for patient management.
- Quality assurance studies are essential for identifying and rectifying diagnostic errors.
Purpose of the Study:
- To evaluate the accuracy of frozen-section diagnoses.
- To identify the sources and nature of diagnostic inaccuracies.
- To determine the impact of frozen-section errors on patient care.
Main Methods:
- Retrospective quality assurance study.
- Analysis of 30,278 surgical pathology specimens over 18 months.
- Review of frozen-section diagnoses, including false positives, false negatives, and deferrals.
Main Results:
- 4.7% of specimens underwent frozen-section examination.
- 0.4% false-positive and 1.1% false-negative diagnoses of malignancy were recorded.
- 3.7% of diagnoses were deferred, with soft-tissue, breast, and lymph node sites most affected.
- Interpretation errors (57%) and sampling issues (microscopic 24%, gross 9.5%) were primary causes of inaccuracies.
- Poor communication between pathologists and surgeons contributed to diagnostic errors (9.5%).
Conclusions:
- Frozen-section diagnoses have a low rate of error, but inaccuracies do occur.
- Interpretation and sampling are the main contributors to frozen-section errors.
- Modifications in procedure, technique, and interdisciplinary communication can potentially minimize diagnostic errors.