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  • Title: Diagnosis of pulmonary amyloidosis by transbronchial biopsy.
    Author: Kline LR, Dise CA, Ferro TJ, Hansen-Flaschen JH.
    Journal: Am Rev Respir Dis; 1985 Jul; 132(1):191-4. PubMed ID: 4014866.
    Abstract:
    Previously reported cases of pulmonary parenchymal amyloidosis were diagnosed by open lung biopsy or postmortem examination. We describe 3 patients who were found to have amyloid deposits within the lung parenchyma by flexible fiberoptic bronchoscopy. In each case, the diagnosis was suspected when a waxy eosinophilic substance was observed within the alveolar walls of transbronchial biopsy specimens stained with hematoxylin-eosin. When stained with Congo red and examined under polarized light, this amorphous material exhibited the apple-green birefringence characteristic of amyloid fibrils. We suggest that a diagnosis of pulmonary amyloidosis can be made by transbronchial biopsy provided the appropriate histologic stains are employed. Special stains for amyloid should be obtained whenever histologic sections from transbronchial biopsy specimens reveal amorphous eosinophilic material within the alveolar septa or within the walls of small vessels.
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