ArticleVirchows Archiv : an international journal of pathology2026
Trichrome-based deep learning for quantitative assessment of steatosis, hepatocellular ballooning, and fibrosis in metabolic dysfunction-associated steatohepatitis.
Article in Virchows Archiv : an international journal of pathology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
aimsThis study aimed to develop and evaluate Tri-MASH, a trichrome-based deep learning model for quantitative assessment of steatosis, classic hepatocellular ballooning, and fibrosis, and to explore their spatial relationships. Inflammatory-cell density was evaluated as an exploratory measure. METHODS AND
resultsTri-MASH was trained using 161 training specimens and internally evaluated on 30 randomly selected, nonoverlapping specimens. External evaluation comprised 39 biopsies independently scored by four pathologists and 524 baseline and week-72 biopsies from 262 clinical-trial participants. Internal-validation F1 scores ranged from 78.9% for inflammatory-cell detection to 99.2% for sinusoidal fibrosis. In cohort 1, associations with median pathologist assessments were very strong for steatosis (Rs = 0.85) and fibrosis (Rs = 0.87-0.88) and moderate for ballooning (Rs = 0.55). In cohort 2, exploratory pooled analyses showed moderate associations for steatosis (Rs = 0.52), ballooning (Rs = 0.54), and total and portal-septal fibrosis (Rs = 0.50); confidence intervals and p values were unadjusted for repeated observations within participants. Inflammatory-cell density correlated poorly with lobular inflammation grade (Rs=-0.01 to 0.14). Continuous measurements characterized within-arm longitudinal variation, including variation despite unchanged fibrosis stage. In a selected 50-biopsy subset enriched for NAS ballooning grade 2, case-specific median distances to sinusoidal fibrosis were shorter for ballooned hepatocytes than for lipid droplets (p < 0.0001).
conclusionsTri-MASH enables integrated quantitative and spatial analysis of steatosis, classic hepatocellular ballooning, and fibrosis on a single trichrome section. The current data support its use as an adjunctive quantitative research platform rather than a replacement for conventional H&E-based assessment or standalone clinical grading; inflammatory-cell output did not reproduce conventional lobular inflammation grading.
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