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Diffuse panbronchiolitis: diagnosis and distinction from various pulmonary diseases with centrilobular interstitial

M Iwata1, T V Colby, M Kitaichi

  • 1Department of Pathology, Mayo Clinic, Rochester, MN.

Human Pathology
|April 1, 1994
PubMed

Insights

Diffuse panbronchiolitis (DPB) is a rare airway disease characterized by inflammation in respiratory bronchioles. Distinguishing DPB from similar conditions requires careful clinical and histological evaluation to ensure accurate diagnosis.

Area of Science:

  • Pulmonology
  • Pathology
  • Respiratory Medicine

Background:

  • Diffuse panbronchiolitis (DPB) is a clinicopathologic entity primarily affecting respiratory bronchioles.
  • It is characterized by chronic inflammation and foam cell accumulation within the respiratory bronchiolar walls and adjacent airspaces, termed the PB unit lesion.
  • Familiarity with DPB and its distinctive pathology is limited among pathologists outside Japan.

Purpose of the Study:

  • To describe the clinicopathologic features of Diffuse Panbronchiolitis (DPB).
  • To differentiate DPB from histologically similar lesions (PB-like lesions) observed in various lung diseases.
  • To emphasize the importance of clinical context in diagnosing DPB.

Main Methods:

  • Histological examination of seven cases of DPB.
  • Review of 20 cases exhibiting PB-like lesions in conditions including bronchiolitis, cystic fibrosis, bronchiectasis, and others.
  • Comparative analysis of histological findings between DPB and PB-like lesions.

Main Results:

  • The study identified a distinctive PB unit lesion in DPB, involving chronic inflammation and foam cells in respiratory bronchioles.
  • Histologically similar PB-like lesions were found in a variety of other pulmonary diseases.
  • PB-like lesions were determined to be nonspecific histologic findings.

Conclusions:

  • The diagnosis of Diffuse Panbronchiolitis requires integration of clinical findings with histological evidence.
  • Histological similarity to DPB can be observed in other chronic airway and lung diseases.
  • Careful exclusion of alternative conditions is crucial for a definitive DPB diagnosis.

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