Differential Diagnoses for Pleuritic Chest Pain with Cough in Children
The most critical differential diagnosis in a child presenting with pleuritic chest pain and cough is parapneumonic effusion/empyema, which requires immediate hospital admission and aggressive evaluation if the child appears more unwell than expected for simple pneumonia. 1
Primary Infectious Causes
Parapneumonic Effusion/Empyema (Most Common Serious Cause)
This is the predominant consideration when pleuritic chest pain accompanies cough in children. Children with parapneumonic effusion typically present with classic pneumonia symptoms (fever, cough, breathlessness, poor appetite, abdominal pain, halitosis, lethargy) but are notably more unwell than with simple pneumonia alone. 1 They characteristically lie on the affected side to splint the hemithorax and provide temporary analgesia 1.
Key bacterial pathogens include:
- Streptococcus pneumoniae (most common)
- Staphylococcus aureus (especially in developing countries during hot/humid months)
- Gram-negative organisms (Klebsiella, Pseudomonas aeruginosa) in specific contexts
- Anaerobes in aspiration cases 1
Critical clinical pearl: If a child remains pyrexial or unwell 48 hours after admission for pneumonia, parapneumonic effusion/empyema must be excluded 1.
Mycoplasma Pneumonia
Pleural effusion is reported with mycoplasma infection, though empyema is rare. This organism can cause arthralgia in addition to respiratory symptoms 1, 2.
Viral Pleuritis
Common viral pathogens causing pleuritic pain include:
- Coxsackieviruses
- Respiratory syncytial virus
- Influenza and parainfluenza
- Adenovirus
- Epstein-Barr virus
- Cytomegalovirus 3
Important caveat: Viral infections may precede secondary bacterial infections that then cause empyema. Adenovirus and influenza can cause effusions, but they are rarely large 1.
Tuberculous Empyema
This results from progressive pulmonary tuberculosis and accounts for up to 6% of empyema cases worldwide, though it's seldom seen in developed countries with modern antituberculous chemotherapy 1. Consider tuberculosis, immunodeficiency, inhaled foreign body, and malignancy in children not responding to standard treatment 1.
Non-Infectious Causes
Pulmonary Embolism (Critical to Exclude)
PE is the most common serious cause of pleuritic chest pain in adults (5-21% of emergency presentations) and can mimic infectious pleuritis in children 3, 4. A 14-year-old case report demonstrated PE misdiagnosed as viral pleuritis on multiple ED visits 4.
Risk factors to assess:
- Nephrotic syndrome (hypoalbuminemia, proteinuria)
- Hypercoagulable states
- Prolonged immobilization
- Oral contraceptive use in adolescents
Pericarditis
In children with inflammatory/infectious clinical context, pericarditis is a key differential 5. One case report described an 11-year-old with intermittent chest pain, fever, cough, and large pericardial effusion over 13 months 6.
Pneumothorax/Pneumomediastinum
These are potentially dangerous complications, particularly in youth with predisposing conditions for aortic dissection or spontaneous pneumothorax 5, 7.
Hypereosinophilic Syndrome (Rare)
A rare presentation includes simultaneous pleural and pericardial effusions with marked hypereosinophilia 8.
Parasitic Infection
Pulmonary paragonimiasis can present with chest pain, fever, cough, pleural effusion, and eosinophilia—often misdiagnosed as tuberculosis. Consider in children with stream water exposure 6.
Diagnostic Approach
Physical examination findings suggesting pleural effusion:
- Unilateral decreased chest expansion
- Dullness to percussion
- Reduced or absent breath sounds
- Scoliosis
- Possible cyanosis from V/Q mismatch 1
Mandatory initial investigations:
- Chest radiograph (PA or AP; no routine lateral needed) 1
- Ultrasound to confirm pleural fluid collection 1
- Blood cultures (including anaerobic bottle)
- Oxygen saturation (SpO₂ <92% indicates severe disease) 1
- Full blood count with differential (assess for eosinophilia)
- Electrolytes (detect inappropriate ADH syndrome)
- C-reactive protein 1
Ultrasound is superior to CT scanning in children—it involves no radiation, requires no sedation, can be performed bedside, and should guide thoracocentesis or drain placement 1.
Critical Management Points
All children with parapneumonic effusion or empyema require hospital admission 1. Intravenous antibiotics must include coverage for Streptococcus pneumoniae 1. Broader spectrum coverage is required for hospital-acquired infections and those secondary to surgery, trauma, or aspiration 1.
Common pitfall: Dismissing pleuritic chest pain as "viral pleuritis" without considering PE, especially in adolescents with risk factors 4.