*May be considred as a variation of bronchopneumonia
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*A hybrid of bronchopneumonia and interstitial pneumonia in which the interstitial inflammation (inflammation of alveolar walls) is restricted to alveoli in the vicinity of terminal bronchioles from which the infections spread
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*Like broncho-pneumonia it is most common in '''cranioventral lobes'''
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*Inhaled mycoplasmas and some viruses
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*Initial inflammatory reaction occurring in the bronchioles, but its main expression being an interstitial lymphocytic proliferation, often to the extent of forming complete lymphoid follicles around the airways - a cell-mediated response to chronic persistent antigenic challenge