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Fig. 2 | BMC Pulmonary Medicine

Fig. 2

From: The new useful high-resolution computed tomography finding for diagnosing fibrotic hypersensitivity pneumonitis: “hexagonal pattern”: a single-center retrospective study

Fig. 2

The pathological specimen of the patient with hexagonal pattern in HRCT. a, b The HRCT shows interlobular septal thickening expanding from the subpleural region to two or more inner layers of the secondary pulmonary lobules. c, d The specimen of right S9 obtained via surgical lung biopsy. Perilobular fibrosis and bridging fibrosis connecting the fibrosis in the centrilobular area and the fibrosis in the perilobular area were observed. The arrows indicate bridging fibrosis. In this case, the hexagonal pattern observed in the HRCT corresponded to perilobular fibrosis. ILS, interlobular septum; V, vein; A, artery; RB, respiratory bronchiole; HE, hematoxylin and eosin; EvG, Elastica van Gieson

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