This document discusses several lung diseases that present with diffuse patterns on clinical imaging. It includes brief descriptions and chest x-ray or CT scan images showing the lung involvement of conditions such as sarcoidosis, tuberous sclerosis, pulmonary candidiasis, pulmonary Langerhans cell histiocytosis, chickenpox pneumonia, measles pneumonia, amyloidosis, and busulfan-induced lung disease. The images demonstrate reticulonodular, reticulonodular hilar adenopathy, interstitial fibrosis with honeycombing, diffuse nodules, and air-space consolidation patterns of lung involvement.