Nonspecific interstitial pneumonia: radiologic, clinical, and pathologic considerations

Area of Science:

• Pulmonology
• Radiology
• Pathology

Background:

• Nonspecific interstitial pneumonia (NSIP) exhibits diverse clinical, pathological, and radiological features.
• Two primary histologic subtypes, cellular and fibrotic NSIP, are distinguished by inflammation and fibrosis levels.
• Accurate differentiation from other diffuse lung diseases like usual interstitial pneumonia and hypersensitivity pneumonitis is vital due to differing prognoses and treatments.

Purpose of the Study:

• To outline the key diagnostic features of NSIP.
• To highlight the importance of distinguishing NSIP from other interstitial lung diseases.
• To emphasize the role of a collaborative, multidisciplinary diagnostic approach.

Main Methods:

• Review of clinical, pathological, and high-resolution computed tomography (HRCT) findings in NSIP.
• Comparison of NSIP imaging characteristics with other interstitial lung diseases.
• Assessment of the utility of a consensus-based diagnostic strategy.

Main Results:

• Common HRCT findings for NSIP include lower lobe, peripheral ground-glass opacities, reticular abnormalities, traction bronchiectasis, and volume loss.
• Uncommon findings like nodules or cysts suggest alternative diagnoses.
• Associated findings suggestive of collagen vascular disease are important to identify.

Conclusions:

• NSIP diagnosis is challenging, necessitating collaboration among clinicians, pathologists, and radiologists.
• A consensus approach integrating all diagnostic data offers the highest likelihood of accurate NSIP diagnosis.
• Recognizing HRCT patterns and potential associations aids in differentiating NSIP.