Abstract
A systematic approach to the diagnosis of disseminated lung disease is more accurate and comprehensive than one based on the memorization of the appearance of each disease. The patterns of disseminated diseases are based on the pathophysiological changes. They are: alveolar, interstitial, bronchial, vascular and mixed. Each pattern has its own characteristics and list of causes.The alveolar pattern is the most common in small animals. Pathogenesis and radiographic characteristics of the pattern, and the ways in which diseases cause it, are described.Differential diagnosis, using clinical and radiographic findings, is discussed.

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