Figure 1: Histological features of sarcoid TIN (Masson Trichrome): (a) Low-power view showing interstitial inflammation, fibrosis, and epithelioid granulomas (arrow), (b) Diffuse granulomas (arrows) concentrated around vessels, (c) There is granuloma adjacent to a normal glomeruli without involvement of Bowman capsule, (d) Multinucleated giant cells and infiltration by lymphocytes.