- A self-limited inflammation of the tracheobronchial tree.
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- Acute viral infection of the lower respiratory tract causing respiratory distress.
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- An irreversible dilation of the tracheobronchial tree, with destruction of the bronchial walls.
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- Ductal carcinomas account for 75% of all breast cancer; lobular and nipple carcinomas account for most of the remaining 25%.
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- An expanding, intracranial lesion that may be either benign or malignant. However, since both types can be lethal if inaccessible or left untreated, and since malignant tumors rarely metastasize beyond the central nervous system, the distinction serves mainly to describe the rate of growth and invasiveness. Tumors are divided into six classes, according to their origin: (1) skull, (2) meninges, (3) cranial nerves, (4) neuroglia, (5) pituitary/pineal body, and (6) congenital.
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