Coronavirus disease 2019 vaccination-induced acute exacerbation in idiopathic pulmonary fibrosis.

We report a rare case of acute exacerbation (AE) of idiopathic pulmonary fibrosis (IPF) after coronavirus disease 2019 (COVID-19) vaccination. Clinicians should be aware of this COVID-19 vaccination-induced AE in IPF.

Multiple endotracheal metastases of combined small cell lung carcinoma.

We report a very rare case of combined small cell lung carcinoma (C-SCLC) which presented as persistent cough and was due to endotracheal metastases. Clinicians should be aware of this unusual site of metastases from a C-SCLC.

Immunoglobulin G4-positive interstitial pneumonia associated with pleuroparenchymal fibroelastosis.

A 79-year-old former smoking Japanese man was admitted to our hospital with a 2-year history of dry cough and dyspnoea on exertion. High-resolution computed tomography of the chest revealed reticulation and perilobular opacity with bronchial wall thickening and ground-glass opacities (GGOs) in both lungs, in addition to subpleural dense consolidation (pleuroparenchymal fibroelastosis-like lesion; PPFE-like lesion) predominantly in the bilateral upper lobes. Serum immunoglobulin G4 (IgG4) was elevated (348 mg/dl).

Post-coronavirus disease 2019 organizing pneumonia confirmed pathologically by video-assisted thoracoscopic surgery.

Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2, has become a global pandemic. Many survivors of serious COVID-19 pneumonia have long-term residual pulmonary disease. However, there is little documentation of the histopathological characteristics of lung sequelae post-COVID-19 and effective treatments.

Acute exacerbation in chronic bird fancier's lung with pleuroparenchymal fibroelastosis.

A 71-year-old non-smoker woman was admitted to our hospital complaining of a six-month history of dry cough. She had kept java sparrow for nine years and has been raising budgerigars for the previous eight months. High-resolution computed tomography (HRCT) images of the chest revealed reticulonodular lesions predominantly in the bilateral upper lobes.

Miliary opacities in pulmonary sarcoidosis.

Pulmonary sarcoidosis should be considered in the differential diagnosis of miliary opacities in bilateral upper lobes predominance.