Fig. 2From: Systemic AL amyloidosis presenting with diffuse alveolar septal involvement and respiratory failure: a case report and review of the literatureHistopathology of lung biopsy. Congo red staining showed marked thickening of the alveolar wall and deposition of amorphous eosinophilic amyloid at the bronchial mucosa, pulmonary vessel wall, and interstitiumBack to article page