Chest X-Ray in Suspected DRESS Syndrome
A chest X-ray should be obtained in all patients with suspected DRESS syndrome presenting with fever, rash, and lymphadenopathy to evaluate for pulmonary involvement (pneumonitis) and exclude alternative diagnoses such as infection, though it has limited sensitivity for detecting early or subtle lung disease. 1, 2
Primary Role of Chest X-Ray in DRESS
Chest radiography serves primarily to screen for pulmonary complications and exclude alternative diagnoses rather than to confirm DRESS syndrome itself, as the diagnosis remains clinical based on the RegiSCAR scoring system 1, 3
Pulmonary involvement occurs in DRESS syndrome and manifests as pneumonitis, which can be detected on chest imaging as interstitial infiltrates 4, 5
The chest X-ray is part of the complete initial workup recommended for all suspected DRESS cases, which includes total body skin examination, complete blood count with differential, liver and kidney function tests, urinalysis, blood cultures, and skin biopsy if diagnosis is uncertain 6
Limitations and When to Advance Imaging
A normal chest radiograph does not exclude clinically important lung disease in DRESS syndrome, as chest X-rays have lower sensitivity compared to CT imaging for detecting diffuse lung abnormalities 7
If pulmonary symptoms are present or chest X-ray shows abnormalities, chest CT without contrast should be obtained to better characterize the extent and pattern of lung involvement, as CT can confirm airspace abnormalities and help exclude alternative causes such as infection or malignancy 7, 8
CT imaging is superior for evaluating the distribution and extent of lung disease, which may have prognostic value in patients with systemic involvement 7
Clinical Context and Diagnostic Workup
DRESS syndrome characteristically presents 2-6 weeks after drug exposure with morbilliform rash involving >30% body surface area, fever >38°C, eosinophilia >700/μL, lymphadenopathy, and multi-organ involvement 1, 9, 10
Pulmonary involvement is one of several potential organ manifestations, alongside hepatitis (most common), nephritis, myocarditis, and pericarditis 1, 2
The chest X-ray helps establish a baseline for monitoring disease progression and response to treatment, particularly when systemic corticosteroids are initiated 7
Critical Management Considerations
Immediate discontinuation of the suspected causative drug is the first and most crucial step, followed by prompt dermatology consultation and initiation of systemic corticosteroids (IV methylprednisolone 1-2 mg/kg/day) 1, 2, 6
Severe cases with pulmonary involvement require admission to ICU or burn unit with appropriate supportive care, infection prevention, and multidisciplinary consultation 2, 6, 9
Blood cultures should be performed if the patient is febrile to rule out infectious mimics, as infections can present with similar radiographic findings 1
Common Pitfalls to Avoid
Do not delay treatment while waiting for imaging results if clinical suspicion for DRESS is high, as mortality can reach 10% and is most commonly from fulminant hepatitis or multi-organ failure 10
Do not rely solely on chest X-ray to exclude pulmonary involvement, as early or subtle pneumonitis may not be visible on plain radiography 7
Unlike Stevens-Johnson syndrome, corticosteroids are not contraindicated in DRESS syndrome and are essential for managing the T-cell immune-directed toxicity 2, 6