Persistent pulmonary interstitial emphysema with respiratory infection:
a clinicopathological analysis of six cases and detection of infectious
pathogens by metagenomic next-generation sequencing (mNGS)
Abstract
Objective: Persistent pulmonary interstitial emphysema (PPIE) is always
related to mechanical ventilation and preterm. Its relationship with
respiratory infection has rarely been reported in the literature. PPIE
is difficult to diagnosis, always mimics with other cystic lesions. The
objective of this study was to evaluate clinicopathological radiographic
features of PPIE with respiratory infection and to detect the possible
infectious pathogens. Methods: We retrospectively reviewed a total of
237 patients pathologically diagnosed with cystic lesions in West China
Hospital of Sichuan University from January 2011 to April 2019. This
retrospective cohort study analyzed clinicopathological radiographic
features and to detect the infectious pathogens by metagenomic
next-generation sequencing (mNGS). Results: Six cases were presented
with primary syndrome of respiratory infection. There were four girls
and two boys, ranged from 2 months to 5 years. 100% (5/5) available
cases were full-term and without mechanical ventilation. CCAM were
suspected in 66.7% (4/6) patients. 66.7% (4/6) cases affected only a
single lobe, and 33.3% (2/6) cases affected both lung lobes. The
pathologic characteristics showed lung cysts with variable size along
the bronchovaslcular bundles, the cysts had a discontinuous fibrotic
wall with a smooth inner surface, lined with uninucleated and/or
multinucleated macrophages. Conclusions: Six rare cases of PPIE with
respiratory infection were treated by lobectomy. All available five
cases were full-term infants without mechanical ventilation. And we
firstly tried to detect of infectious pathogens by mNGS, however, there
was no certain infectious pathogen associated with PPIE in our study.