(F) Masson's trichrome representative images and correlation between lung fibrosis and vascular wall thickness in PF and PF-PH patients. Out of the 14 PF and PF-PH patients, 3 of them had no non-fibrotic area and therefore were excluded for comparison between non-fibrotic and fibrotic areas (n=11/group; Ashcroft score non-fibrosis: 0-2; mild-fibrosis: 3-5; severe-fibrosis >5) (* compared to non-fibrotic areas of the same group of patients). 