The upward shift of hilar structures and tracheal deviation in pleuroparenchymal fibroelastosis.

The upward shift of hilar structures is a characteristic finding on chest radiographs in pleuroparenchymal fibroelastosis (PPFE). However, the relationship between the hilar shift and clinical parameters is unclear. In this study, the ratio of the length of the lung apex to the hilum and the length of the apex to the base of the right lung was measured using chest computed tomography (CT) at the time of the diagnosis, and the relationship with clinical parameters was investigated. We also examined the deviations of the trachea on chest radiographs and compared them with those in idiopathic pulmonary fibrosis (IPF) and early-stage lung cancer. Thirty-eight PPFE patients in a previous study included 20 patients who simultaneously showed the lower lobe lesions. The median ratio of the length of the apex to the hilum/apex to the base was 0.32 (range: 0.10-0.41) in PPFE, and this value was significantly lower than that in IPF (0.39; 0.32-0.45,

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Institutional Review Board approved the study protocol and waived the requirement for informed consent (approval number 16–2-23 at Fukuoka University Hospital).All authors provide their consent for the publication of this report.The authors declare that they have no competing interest.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.