Histopathological Findings (hematoxylin-eosin). Surgical lung biopsy specimen at low power (a:case 1, b:case 5) and high power (a, inset) showed markedly thickened visceral pleura and prominent subpleural fibrosis characterized by abnormal increase of elastic tissue and dense collagen. Abrupt transition to normal parenchyma was also seen. Parenchyma distant from the pleura was spared.
Kusagaya et al. BMC Pulmonary Medicine 2012 12:72 doi:10.1186/1471-2466-12-72