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obstructive pneumonia

Medical; Histology

Changes seen in the lung parenchyma distal to an obstruction, regardless of cause. This disorder typically includes accumulation of foamy macrophages within alveoli, inspissated ...

old granuloma

Medical; Histology

A term for a nodule with fibrotic rim and necrotic center that is usually, but not always, the result of an old healed infectious granuloma. A palisaded histiocytic rim around the ...

organizing pneumonia

Medical; Histology

A reparative reaction in the lung with organizing granulation tissue filling alveolar ducts and associated alveoli with only focal attachment to the interstitium where the ...

angiocentric

Medical; Histology

A descriptive term for lesions that appear to center on vessels. Angiocentricity may be appreciated with lesions that are actually centered on vessels (either arteries or veins) ...

septal

Medical; Histology

Septal refers to the interlobular septa and structures in them, including veins, lymphatics, and connective tissue.

acinus

Medical; Histology

The functional unit of the lung: a respiratory bronchiole and its alveolar ducts and alveolar sacs. (Note: The definition of "acinus" varies somewhat in the literature.)