| eye diseases, hereditary | Transmission of gene defects or chromosomal aberrations/abnormalities which are expressed in extreme variation in the structure or function of the eye. These may be evident at birth, but may be manifested later with progression of the disorder. (12 Dec 1998) |
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| urogenital diseases | Diseases of the urogenital tract. (12 Dec 1998) |
| urologic and male genital diseases | A collective term for urinary tract diseases in male and female and diseases of the male genitalia. (12 Dec 1998) |
| urologic diseases | Diseases of the urinary tract in both male and female. It does not include the male genitalia for which urogenital diseases is used for general discussions of diseases of both the urinary tract and the genitalia. (12 Dec 1998) |
| uveal diseases | Diseases of the uvea. (12 Dec 1998) |
| fish diseases | Diseases of freshwater, marine, hatchery or aquarium fish. This term includes diseases of both teleosts (true fish) and elasmobranchs (sharks, rays and skates). (12 Dec 1998) |
| lacrimal apparatus diseases | Diseases of the lacrimal apparatus. (12 Dec 1998) |
| laryngeal diseases | Disorders of the larynx, general or unspecified. (12 Dec 1998) |
| lipid storage diseases | A series of disorders due to inborn errors in lipid metabolism resulting in the abnormal accumulation of lipids in the wrong places (examples include gaucher, fabry and niemann-pick diseases and metachromatic leukodystrophy). (12 Dec 1998) |
| liver diseases, alcoholic | Liver diseases associated with alcoholism. It usually refers to the coexistence of two or more subentities, i.e., alcoholic fatty liver, alcoholic hepatitis, and alcoholic liver cirrhosis, but may be the general entity when subentities are not specified. (12 Dec 1998) |
| liver diseases, parasitic | Infections of the liver with a parasite. They are caused most commonly by trematodes (flukes). (12 Dec 1998) |
| lung diseases, interstitial | A heterogeneous group of noninfectious, nonmalignant disorders of the lower respiratory tract, affecting primarily the alveolar wall structures but also often involving the small airways and blood vessels of the lung parenchyma. "interstitial" refers to the fact that the interstitium of the alveolar walls is thickened, usually by fibrosis. This group of diseases is usually inflammatory. (12 Dec 1998) |
| lung diseases, obstructive | Any disorder marked by persistent obstruction of bronchial air flow. (12 Dec 1998) |
| lung diseases, parasitic | Infections of the lungs with a parasite. They are caused most commonly by nematodes (roundworms). (12 Dec 1998) |
| lymphatic diseases | Diseases of lymph or lymph vessels. (12 Dec 1998) |