Plueral effusion casuese
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pleural effusion causes diagnostic approach authoritative guideline
Pleural effusion is excess fluid in the space between the lung and chest wall. Causes are usually grouped as transudative or exudative.
1. Transudative effusion
Caused by altered pressure in blood vessels or low blood protein.
- Heart failure - most common
- Cirrhosis with ascites - hepatic hydrothorax
- Nephrotic syndrome or severe low albumin
- Kidney failure or fluid overload
- Constrictive pericarditis
- Peritoneal dialysis
- Atelectasis, occasionally
2. Exudative effusion
Caused by inflammation, infection, cancer, embolism, or injury to the pleura.
- Pneumonia - parapneumonic effusion; infected fluid is called empyema
- Tuberculosis, especially in high-prevalence regions
- Malignancy - lung, breast, lymphoma, metastatic cancers
- Pulmonary embolism
- Autoimmune disease - rheumatoid arthritis, systemic lupus erythematosus
- Pancreatitis or oesophageal rupture - often with raised pleural-fluid amylase
- Trauma or surgery
- Drug reactions, for example amiodarone, methotrexate, nitrofurantoin
- Viral, fungal, or other infections
Less common special types
- Hemothorax: blood in the pleural space, usually trauma, surgery, or malignancy
- Chylothorax: lymphatic fluid, often thoracic-duct injury or lymphoma
- Urinothorax: urine entering pleural space due to urinary obstruction or trauma
The common adult causes are heart failure, cancer, pneumonia, pulmonary embolism, and tuberculosis. In the US, heart failure, cirrhosis, and nephrotic syndrome are leading transudative causes, while pneumonia, cancer, pulmonary embolism, and TB are leading exudative causes, as summarized by the Merck Manual overview.
Urgent assessment is needed for breathlessness at rest, low oxygen, fever with chest pain, confusion, coughing blood, or a rapidly enlarging effusion. A chest X-ray/ultrasound and sometimes thoracentesis are used to identify the cause.
Plueral effusion unilateral and bilateral causes
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unilateral versus bilateral pleural effusion causes guideline
Unilateral vs bilateral pleural effusion: common causes
| Pattern | More likely causes | Helpful clues |
|---|---|---|
| Unilateral | Pneumonia/parapneumonic effusion or empyema, malignancy, tuberculosis, pulmonary embolism, trauma/hemothorax, pancreatitis, chylothorax, rheumatoid pleuritis | Usually an exudate. New unexplained unilateral fluid often needs ultrasound-guided thoracentesis. |
| Bilateral | Congestive heart failure, renal failure/fluid overload, hypoalbuminaemia or nephrotic syndrome, liver failure/cirrhosis, widespread malignancy, bilateral pulmonary emboli, autoimmune disease such as SLE | Often a transudate, especially with heart, renal, liver, or low-protein disease. |
Important side-specific patterns
- Heart failure: usually bilateral, sometimes right-sided more than left.
- Cirrhosis with ascites (hepatic hydrothorax): characteristically right-sided, but may be bilateral.
- Pneumonia: commonly unilateral and on the same side as the pneumonia.
- Tuberculosis: often unilateral, usually lymphocyte-rich exudate.
- Cancer: can be unilateral or bilateral; unilateral recurrent effusion raises concern for malignancy.
- Pulmonary embolism: often a small unilateral effusion, though bilateral effusions can occur.
- Pancreatitis: often left-sided, but either side is possible.
- Trauma or recent thoracic surgery: generally unilateral.
Laterality is a clue, not a diagnosis. Heart failure can occasionally produce a unilateral effusion, and cancer/infection can be bilateral. The British Thoracic Society pleural guideline lists heart failure, hypoalbuminaemia, renal failure, liver failure, autoimmune disease, widespread malignancy, and bilateral pulmonary emboli among causes of bilateral effusions. The Merck reference table notes that heart-failure effusions are bilateral in most cases, while hepatic hydrothorax is commonly right-sided.
Red flags: fever, pleuritic chest pain, low oxygen, coughing blood, severe breathlessness, or a new large unilateral effusion require prompt medical assessment.
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