geographic ulcer

(redirected from Geographic Ulceration)
A sharply demarcated corneal ulcer with scalloped margins, arising in dendritic keratitis, caused by herpes simplex; ± 12 respond to idoxuridine therapy

geographic ulcer

Ophthalmology A sharply demarcated corneal ulcer with scalloped margins, arising in dendritic keratitis, caused by HSV; ±12 respond to idoxuridine therapy


pertaining to geography.

geographic epidemiology
the effect of climate, terrain, population of humans and animals, industrial enterprises on animal disease. Includes the zoogeography of the subject species itself, plus that of carrier species, and vectors and intermediate hosts, especially mobile ones such as insects. The distribution and concentration of poisonous plants and the use of specific management techniques which put the animals at greater risk are also important.
geographic ulcer
see geographic ulcer.


a local defect, or excavation of the surface of an organ or tissue, produced by sloughing of necrotic inflammatory tissue. They occur in all organs and tissues and are to be found under those headings, e.g. abomasal, corneal, gastric.

button ulcer
see button ulcer.
callous ulcer
see set-fast (2).
collagenase ulcer
a rapidly expanding, erosive ('melting') corneal ulcer, seen particularly in brachycephalic breeds of dogs.
Curling's ulcer
acute ulceration of the stomach or duodenum seen after severe burns of the body in humans.
decubitus ulcer
see decubitus ulcer.
dendritic ulcer
linear, branching pattern of ulceration on the cornea; characteristic of herpesvirus infections. See also herpetic keratitis.
eosinophilic ulcer
see eosinophilic ulcer.
gastroduodenal ulcer
common in foals 1-3 months old. Many are asymptomatic. Clinical cases manifest by mild, intermittent colic. See also gastric ulcer, duodenal ulcer.
geographic ulcer
a large, superficial, irregularly shaped corneal ulcer, typically formed by the coalescence of several dendritic ulcers.
indolent ulcer
see eosinophilic ulcer, refractory ulcer (below).
infectious dermal ulcer
a systemic, fatal bacteremia of snakes manifested by multiple, small cutaneous ulcers. Called also scale rot.
intestinal ulcer
is rare in all species. When they do occur, intestinal ulcers usually cause signs of chronic enteritis. It is a common lesion in adenocarcinoma of the intestine. See also peptic ulcer.
lip ulcer
see eosinophilic ulcer.
lip and leg ulcer
see ulcerative dermatosis.
melting ulcer
see collagenase ulcer (above).
ulcer mound
a gastric ulcer viewed tangentially radiographically creates a mound in the otherwise smooth outline of radiopaque material in the stomach.
necrotic ulcer of swine
see ulcerative granuloma of swine.
perforating ulcer
one that involves the entire thickness of an organ, creating an opening on both surfaces. See also ulcer perforation.
phagedenic ulcer
a necrotizing lesion in which tissue destruction is prominent.
refractory ulcer
a chronic, superficial corneal ulceration in dogs, particularly common in Boxers, that extends into the superficial stroma, often undermining epithelium at the edges. The cause is unknown but abnormalities of the basal epithelial cells and anterior stroma have been noted. Response to the usual methods of treatment for corneal ulceration is characteristically very slow; superficial keratectomy is the treatment of choice. Called also superficial corneal erosion syndrome, Boxer ulcer.
rodent ulcer
see eosinophilic ulcer.
stress ulcer
superficial ulcerations or erosions of mucosa in the stomach, duodenum or colon. The possible predisposing factors include changes in the microcirculation of the gastric mucosa, increased permeability of the gastric mucosa barrier to H+, and impaired cell proliferation.
stromal ulcer
a corneal ulcer involving the stroma.
trophic ulcer
one due to imperfect nutrition of the part. In dogs, may develop in digital and metatarsal pads in association with tibial nerve injury.
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