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Malignant Pericardial Fluid Analysis — EECC MCQ

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ModeratePericardial DiseaseMalignant Pericardial Fluid AnalysisEECC

A 45-year-old man presents with sharp pleuritic chest pain and a pericardial effusion. His pericardial fluid is sent for analysis. The fluid is haemorrhagic with protein 55 g/L, LDH 450 IU/L, and glucose 2.1 mmol/L. Cytology shows malignant cells. What is the most likely diagnosis?

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Correct answer: A — Malignant pericardial effusion — haemorrhagic exudative fluid with malignant cells on cytology; the most common primary tumours causing malignant pericardial effusion are lung, breast, and haematological malignancies

Pericardial fluid analysis follows Light's criteria for exudate/transudate differentiation (similar to pleural fluid). Characteristics of malignant pericardial effusion include: (1) haemorrhagic (blood-stained — though not all haemorrhagic effusions are malignant); (2) exudative (high protein >30 g/L, high LDH, pericardial-to-serum protein ratio >0.5); (3) low glucose (<3.3 mmol/L — consumed by malignant cells); (4) positive cytology (diagnostic sensitivity ~60-90% for carcinoma, lower for lymphoma/mesothelioma). The most common tumours causing malignant pericardial effusion are: lung carcinoma (most common), breast carcinoma, lymphoma/leukaemia, and melanoma. The 2025 ESC Pericarditis Guidelines recommend pericardial fluid analysis (cytology, biochemistry, microbiology, PCR) whenever pericardiocentesis is performed.

Reference: ESC (2025): Myocarditis/Pericarditis Guidelines