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The chest CT, KL-6 levels, and PASI score of case 8 (81-year-old man) are shown. Subpleural ground-glass and irregular linear (reticular) opacity distributed in the lower lobes improved with UST treatment temporarily. Discontinuation of the treatment worsened both IP and psoriasis. CT = computed tomography; IP = interstitial pneumonia; KL-6 = Krebs von den Lungen-6; PASI = psoriasis area severity index; UST = ustekinumab.
