primary abscess


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primary abscess

Etymology: L, primus + abscedere, to go away
an abscess that develops at the original point of infection by a pus-producing microorganism.

abscess

a localized collection of pus in a cavity formed by the disintegration of tissue. Most abscesses are formed by invasion of tissues by bacteria, but some are caused by fungi or protozoa or even helminths, and some are sterile. Their effects are determined by their location and the pressure that they exert on nearby organs, and the degree of toxemia that they create from their bacterial content and the amount of tissue destroyed. So that for a reasonably active abscess the syndrome presented will be one of local pain, anorexia and fever, and a leukocytosis. For specific abscesses see under anatomical sites, e.g. brain abscess.

Brodie's abscess
a circumscribed abscess in bone, caused by hematogenous infection that becomes a chronic nidus of infection.
cervical abscess
see vertebral abscess.
cold abscess
one of slow development and with little inflammation, e.g. caseous lymphadenitis of sheep and goat.
cornea stromal abscess
small ulcers or puncture wounds of the corneal epithelium may permit entry of bacteria then heal, creating an abscess. Particularly important in horses.
diffuse abscess
a collection of pus not enclosed by a capsule.
facial subcutaneous abscess
a disease of cattle eating hay or pasture containing mature grass awns.
gas abscess
one containing gas, caused by gas-forming bacteria such as Clostridium perfringens.
grass seed abscess
in cattle occurs as a cold, subcutaneous abscess at the throat or on the mandible and is often diagnosed but rarely confirmed. In dogs it occurs in many sites, but most commonly between the toes. The causative grass awn(s) may be recovered by forceps or, in more extensive lesions, surgical exploration.
infraorbital abscess
occurs in birds as a sequel to chronic upper respiratory infection with sinusitis.
injection site abscess
an iatrogenic lesion resulting from incomplete skin disinfection before injection; usually contains Arcanobacterium pyogenes.
intra-abdominal abscess
include diaphragmatic, mesenteric, retroperitoneal; many are subclinical; clinical signs include those of chronic peritonitis. Called also omental bursitis.
maxillary abscess
see malar abscess.
mediastinal abscess
a very large abscess in this site may cause signs of congestive heart failure due to compression of pericardium and venae cavae.
miliary abscess
one of a set of small abscesses.
milk abscess
abscess of the mammary gland occurring during lactation.
pectoral abscess
a disease of horses in which abscesses occur in the pectoral muscles and ventral midline, and in some cases in internal organs, causing local pain and swelling and eventually rupturing and draining to the exterior. Endemic to areas of California, Texas and Colorado in the USA where it is also known as pigeon fever and has epidemic occurrence in the autumn of some years with a possible insect vector transmission. Caused by Corynebacterium pseudotuberculosis.
periapical abscess
inflammation and destruction of dental pulp and surrounding tissues, including the periodontal membrane and alveolar bone. The radiographic appearance is a translucency of the tooth apex and adjacent alveolar bone. Most common in dogs.
periorbital abscess
firm masses above or below the eyes occur in birds as a sequel to chronic respiratory disease and sinusitis.
phlegmonous abscess
one associated with acute inflammation of the subcutaneous connective tissue.
phoenix abscess
acute recurrence of a chronic periapical lesion.
primary abscess
one formed at the seat of the infection.
rete mirabile abscess
see pituitary abscess.
retroarticular abscess
one located between the intermediate phalanx and the deep flexor tendon in the hooves of cattle. It may be caused by extension of infection from the navicular bursa or from suppurative arthritis of the distal interphalangeal joint.
retrobulbar abscess
behind the orbit of the eye; cause pain on opening of the mouth, chemosis and exophthalmos, protrusion of the nictitating membrane, and systemic signs of infection. Most common in dogs and cats.
stitch abscess, suture abscess
one developed about a stitch or suture.
vertebral body/epidural abscess
usually of cervical or lumbar vertebrae; causes compression of cord manifested by incoordination, paresis, paralysis.
wandering abscess
one that burrows into tissues and finally points at a distance from the site of origin.