| tuberculous abscess | An abscess caused by the tubercle bacillus. Synonym: cold abscess. (05 Mar 2000) |
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| tubo-ovarian abscess | A large abscess involving a uterine tube and an adherent ovary, resulting from extension of purulent inflammation of the tube. (05 Mar 2000) |
| faecal abscess | A collection of pus and faeces. Synonym: faecal abscess. (05 Mar 2000) |
| lacunar abscess | An abscess involving the urethral lacunae. (05 Mar 2000) |
| follicular abscess | An abscess in a hair, tonsillar, or other follicle. (05 Mar 2000) |
| lateral alveolar abscess | An alveolar abscess located along the lateral root surface of a tooth. Synonym: pericemental abscess. (05 Mar 2000) |
| lateral periodontal abscess | An abscess that forms at the depth of a periodontal pocket due to multiplication of pyogenic microorganisms or the presence of foreign material. (05 Mar 2000) |
| liver abscess | A condition where there is a pus-filled cavity in the liver secondary to a bacterial infection. Liver abscess may result from sepsis, intestinal perforation, post-operative infection, appendicitis, diverticulitis, trauma (to the liver) or cholangitis. Other nonbacterial causes of liver abscess include amoebiasis, due to infection with Entamoeba histolytica (protozoan). (27 Sep 1997) |
| liver abscess, amebic | Liver abscess caused by entamoeba histolytica. (12 Dec 1998) |
| lung abscess | A collection of pus within a cavity in the lung due to a bacterial infection (bacterial endocarditis). Certain bacteria (Staphylococcus, Pseudomonas, Tuberculosis, Klebsiella) are more likely to cavitate the lung and cause abscess formation. (27 Sep 1997) |
| Amberg's lateral sinus line | A line dividing the angle formed by the anterior edge of the mastoid process and the temporal line. (05 Mar 2000) |
| aneurysm of sinus of Valsalva | A congenital thin-walled tubular out pouching usually in the right or non-coronary sinus with an entirely intracardiac course that may rupture into the right or rarely the left heart chambers to form an aortocardiac fistula. (05 Mar 2000) |
| aortic sinus | The space between the superior aspect of each cusp of the aortic valve and the dilated portion of the wall of the ascending aorta, immediately above each cusp. Synonym: sinus aortae, Petit's sinus, Valsalva's sinus. Arlt's sinus, an inconstant depression on the lower portion of the internal surface of the lacrimal sac. Barber's pilonidal sinus, pilonidal sinus occurring in barbers, usually in the web between the fingers, due to the burying of exogenous hairs by the alternate loosening and tightening of tissues of the hand by the manipulation of scissors. (05 Mar 2000) |
| aortic sinus aneurysm | Abnormal dilation of one or more of the three aortic sinuses situated behind the three aortic valve cusps. (05 Mar 2000) |
| apertura sinus frontalis | One of a pair of openings in the floor of the frontal sinuses in the nasal part of the frontal bone, through which the frontal sinuses communicate with the ethmoidal infundibulum via the frontonasal duct. Synonym: apertura sinus frontalis. (05 Mar 2000) |