Grade 4 asbestosis does not extend directly from the respiratory bronchiole to the peripheral lung.
Yoshinori KawabataTakahiko KasaiYoichiro KobashiKunimitsu KawaharaToshimasa UekusaKazuyoshi KurashimaYoshihiko ShimizuPublished in: Histopathology (2018)
Grade 4 asbestosis does not start in the respiratory bronchiole. The presence of a grade 1 lesion is not required for the diagnosis of grade 4 asbestosis.
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