HRCT diagnosis of diffuse parenchymal lung disease: inter-observer variation

Area of Science:

• Radiology
• Pulmonology
• Medical Imaging

Background:

• Assessing inter-observer variability in diffuse parenchymal lung disease (DPLD) diagnosis using high-resolution computed tomography (HRCT).
• Identifying specific challenges in DPLD diagnosis where expert panels could enhance accuracy.

Purpose of the Study:

• To quantify inter-observer agreement among thoracic radiologists in HRCT diagnosis of DPLD.
• To pinpoint diagnostic difficulties and areas where national expert panels would be most beneficial.

Main Methods:

• 131 DPLD patient HRCT scans were reviewed by 11 thoracic radiologists.
• Inter-observer agreement was measured using kappa coefficients for initial diagnoses and weighted kappa for disease likelihood.
• Differential diagnoses and percentage likelihoods were recorded for each case.

Main Results:

• Moderate overall agreement (kappa = 0.48) for initial DPLD diagnosis.
• Higher agreement for cases from regional centers (kappa = 0.60) compared to a tertiary center (kappa = 0.34).
• Non-specific interstitial pneumonia (NSIP) was a common factor in diagnostic disagreements (55%).

Conclusions:

• Good agreement exists for HRCT diagnosis of DPLD in regional centers.
• Cases with low diagnostic confidence, particularly those considering NSIP, could benefit from expert panel consultation.
• Targeted use of reference panels can improve diagnostic accuracy for complex DPLD cases.