Reversible Pulmonary Mass Associated with Long-term Welding Fume Exposure: A Case Report

Abstract

A 68-year-old long-term welder was referred for the evaluation of a right lower lobe opacity after a fever and cough had resolved. Chest CT revealed a mass-like lesion in the right lower lobe with heterogeneous high-attenuation areas and centrilobular nodular opacities in both upper lobes. A transbronchial biopsy of the mass-like lesion showed hemosiderin deposits with fibrosis and mild inflammation, without any findings strongly suggestive of infection or malignancy. The lesion partially regressed following a reduction in welding fume exposure, suggesting a possible association with chronic occupational exposure and a transient non-specific pulmonary insult.The recognition of occupational exposure and short-term follow-up may help avoid unnecessary invasive procedures in the future.

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BibTeX RIS

BibTeX

@article{morita2026reversible,
  title = {{Reversible Pulmonary Mass Associated with Long-term Welding Fume Exposure: A Case Report}},
  author = {Masako Morita and Shingo Takahashi and Atsuki Fukada and Ai Sugimoto and Hiroyuki Matsuda},
  journal = {Internal Medicine},
  year = {2026},
  month = aug,
  doi = {10.2169/internalmedicine.7571-26},
  url = {https://www.jstage.jst.go.jp/article/internalmedicine/advpub/0/advpub_7571-26/_article},
  note = {CC BY-NC-ND},
}

RIS

TY  - JOUR
TI  - Reversible Pulmonary Mass Associated with Long-term Welding Fume Exposure: A Case Report
AU  - Masako Morita
AU  - Shingo Takahashi
AU  - Atsuki Fukada
AU  - Ai Sugimoto
AU  - Hiroyuki Matsuda
PY  - 2026
DA  - 2026/08/25
JO  - Internal Medicine
DO  - 10.2169/internalmedicine.7571-26
UR  - https://www.jstage.jst.go.jp/article/internalmedicine/advpub/0/advpub_7571-26/_article
AB  - A 68-year-old long-term welder was referred for the evaluation of a right lower lobe opacity after a fever and cough had resolved. Chest CT revealed a mass-like lesion in the right lower lobe with heterogeneous high-attenuation areas and centrilobular nodular opacities in both upper lobes. A transbronchial biopsy of the mass-like lesion showed hemosiderin deposits with fibrosis and mild inflammation, without any findings strongly suggestive of infection or malignancy. The lesion partially regressed following a reduction in welding fume exposure, suggesting a possible association with chronic occupational exposure and a transient non-specific pulmonary insult.The recognition of occupational exposure and short-term follow-up may help avoid unnecessary invasive procedures in the future.
SN  - 1349-7235
SN  - 0918-2918
ER  -

Abstract

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