Radiological aspects of diffuse alveolar haemorrhage

Area of Science:

• Radiology
• Pulmonary Medicine
• Medical Imaging

Background:

• Diffuse alveolar haemorrhage (DAH) is a critical condition characterized by bleeding into the lung alveoli.
• Radiological findings are crucial for DAH diagnosis and management.

Purpose of the Study:

• To describe the chest X-ray (CXR) and computed tomography (CT) findings in patients with diffuse alveolar haemorrhage (DAH).
• To evaluate the diagnostic utility of CXR and CT in identifying DAH and its characteristic radiological patterns.

Main Methods:

• Retrospective review of 23 DAH episodes in 20 patients.
• Analysis of chest X-ray (CXR) and computed tomography (CT) imaging findings.
• Evaluation of parenchymal consolidations and ground-glass opacities across lung zones.

Main Results:

• Chest X-ray (CXR) identified alveolar-filling patterns in most patients, predominantly in middle lung fields.
• CT scans revealed ground-glass opacities missed by CXR in some cases, particularly in Wegener's granulomatosis.
• Follow-up imaging showed evolving patterns of consolidation and ground-glass opacities over time.

Conclusions:

• DAH exhibits nonspecific alveolar-filling patterns on imaging.
• Clinical evidence of haemoptysis and/or rapid-onset anaemia is essential for DAH diagnosis.
• CT is more sensitive than CXR for detecting ground-glass opacities and is recommended when DAH is suspected but CXR is normal.