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Published on: August 18, 2016
Pericardial Fluid Metastatic Tumor Distribution and Fluid Volume Analysis: A 10-Year Institutional Experience
Mason Marshall1, Timothy Ramseyer1, Jacqueline Cuda1
1Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA.
Acta Cytologica
|June 19, 2026
Summary
Malignant pericardial effusions are typically metastatic, most commonly from lung and breast cancers. Submitting at least 50 mL of pericardial fluid significantly increases the odds of diagnosing malignancy, with diminishing returns beyond 100 mL.
Area of Science:
- Cytopathology
- Oncology
- Thoracic Medicine
Background:
- Cytologic examination of pericardial effusions is crucial for diagnosing malignant involvement, which has a poor prognosis.
- Limited large-scale studies exist on metastatic tumor distribution and fluid volume's impact on diagnostic yield in pericardial effusions.
Purpose of the Study:
- To evaluate the distribution of metastatic tumors in malignant pericardial effusions.
- To examine the relationship between specimen volume and the likelihood of a malignant cytologic diagnosis.
Main Methods:
- Retrospective review of 1,591 pericardial fluid cytology specimens over 10 years.
- Analysis of cytomorphology, immunohistochemistry, and clinical/radiologic data for malignant cases.
- Stratification of specimen volumes (≥50 mL vs. <50 mL and ≥100 mL) to assess diagnostic yield.
Main Results:
- Malignant cases (14.4%) were predominantly carcinomas (83.5%), especially lung (48.0%) and breast (16.0%), and hematolymphoid malignancies (14.0%).
- Higher specimen volumes correlated with increased diagnostic yield (p=0.0010).
- Specimens ≥50 mL had a significantly higher malignancy rate (18.4% vs. 10.6%, p < 0.001), nearly doubling the odds of malignancy (OR 1.91).
Conclusions:
- Malignant pericardial effusions are usually metastatic, with lung and breast carcinomas being the most common primary tumors.
- Submitting at least 50 mL of pericardial fluid is recommended to optimize diagnostic yield, with no significant benefit beyond 100 mL.
- Understanding metastatic patterns aids in diagnosing effusions with limited cellularity and guides ancillary testing.
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