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. 2023 Jun 22;9:115. doi: 10.1186/s40792-023-01701-z

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Fig. 5 — Pathological findings of the fistula. Masson trichrome stains of the fistula revealing fibrosis replacement (blue area) where muscularis propria (red area) have been replaced by fibrosis. Adjacent ganglion cells were observed (arrow)