rodent ulcer


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ulcer

 [ul´ser]
a local defect, or excavation of the surface of an organ or tissue, produced by sloughing of necrotic inflammatory tissue.
aphthous ulcer a small painful ulcer in the mouth, approximately 2 to 5 mm in diameter. It usually remains for five to seven days and heals within two weeks with no scarring.
chronic leg ulcer ulceration of the lower leg caused by peripheral vascular disease involving either arteries and arterioles or veins and venules of the affected limb. Arterial and venous ulcers are quite different and require different modes of treatment. Venous stasis ulcers occur as a result of venous insufficiency in the lower limb. The insufficiency is due to deep vein thrombosis and failure of the one-way valves that act during muscle contraction to prevent the backflow of blood. Chronic varicosities of the veins can also cause venous stasis.

Patient Care. Stasis ulcers are difficult to treat because impaired blood flow interferes with the normal healing process and prolongs repair. Patient care is concerned with preventing a superimposed infection in the ulcer, increasing blood flow in the deeper veins, and decreasing pressure within the superficial veins.
decubitus ulcer pressure ulcer.
duodenal ulcer an ulcer of the duodenum, one of the two most common types of peptic ulcer.
gastric ulcer an ulcer of the inner wall of the stomach, one of the two most common kinds of peptic ulcer.
Hunner's ulcer one involving all layers of the bladder wall, seen in interstitial cystitis.
hypertensive ischemic ulcer a manifestation of infarction of the skin due to arteriolar occlusion as part of a longstanding vascular disease, seen especially in women in late middle age, and presenting as a red painful plaque on the lower limb or ankle that later breaks down into a superficial ulcer surrounded by a zone of purpuric erythema.
marginal ulcer a peptic ulcer occurring at the margin of a surgical anastomosis of the stomach and small intestine or duodenum. Marginal ulcers are a frequent complication of surgical treatment for peptic ulcer; they are difficult to control medically and often require further surgery.
peptic ulcer see peptic ulcer.
perforating ulcer one that involves the entire thickness of an organ, creating an opening on both surfaces.
phagedenic ulcer
1. any of a group of conditions due to secondary bacterial invasion of a preexisting cutaneous lesion or the intact skin of an individual with impaired resistance as a result of a systemic disease, which is characterized by necrotic ulceration associated with prominent tissue destruction.
pressure ulcer see pressure ulcer.
rodent ulcer ulcerating basal cell carcinoma of the skin.
stasis ulcer ulceration on the ankle due to venous insufficiency and venous stasis.
stress ulcer a type of peptic ulcer, usually gastric, resulting from stress; 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.
trophic ulcer one due to imperfect nutrition of the part.
tropical ulcer
1. a lesion of cutaneous leishmaniasis.
tropical phagedenic ulcer a chronic, painful phagedenic ulcer usually seen on the lower limbs of malnourished children in the tropics; the etiology is unknown, but spirochetes, fusiform bacilli, and other bacteria are often present in the developing lesion, and protein and vitamin deficiency with lowered resistance to infection may play a role in the etiology.
varicose ulcer an ulcer due to varicose veins.
venereal ulcer a nonspecific term referring to the formation of ulcers resembling chancre or chancroid about the external genitalia; there are both sexually transmitted and other types.

ro·dent ul·cer

historic term for a slowly enlarging ulcerated basal cell carcinoma, usually on the face.

rodent ulcer

n.
A cancerous skin ulcer that derives from basal cells and usually occurs on the face.

rodent ulcer

[rō′dənt]
Etymology: L, rodere, to gnaw, ulcus, ulcer
a slowly developing serpiginous ulceration of a basal cell carcinoma of the skin. See also basal cell carcinoma.
An older term for an invasive ulcerated basal cell carcinoma of long duration with indurated ulcer walls

ro·dent ul·cer

(rō'dĕnt ŭl'sĕr)
A slowly enlarging ulcerated basal cell carcinoma, usually on the face.
Enlarge picture
RODENT ULCER: on the ear

rodent ulcer

A basal cell carcinoma that has caused extensive local invasion and tissue destruction, esp. on the face. The usual sites are the outer angle of the eye, near the side and on the tip of the nose, and at the hairline.
Synonym: Jacob ulcer See: illustration
See also: ulcer

rodent ulcer

See BASAL CELL CARCINOMA.

basal cell carcinoma

; BCC; rodent ulcer common skin malignancy caused by long-term exposure to ultraviolet light (sunlight) or irradiation, or from pre-existing naevoid lesions; forms as a pearly nodule that later ulcerates; is locally invasive, but rarely metastatic; treated by excision ± skin graft (see Table 1)
Table 1: Examples of cutaneous neoplastic lesions of the elderly
Lesion typeExamplesComment
BenignSeborrhoeic warts (basal cell papilloma)Slow-growing, clearly demarcated, pigmented, 'stuck-on' dermal lesions that may form skin tags, occurring especially around the neck in obese individuals
PremalignantSolar keratosesSlow-growing pink/grey-brown scaly epidermal lesions occurring in sun-exposed
skin (dorsa of hands, lower leg, face, bald pate) in subjects >60 years of age; lesions should be regularly monitored as they may undergo malignant changes
Bowen's diseaseIntraepidermal carcinoma (epithelioma) presenting as a small, slow-growing scaly plaque that can become nodular or ulcerate if the lesion extends into the dermis; these lesions should be removed or treated with a topical chemotherapeutic agent such as 5-fluorouracil
MalignantSquamous cell carcinomaKeratotic, scaly, elevated or nodular lesion with a depressed centre that may ulcerate, arising in sun-exposed skin; these lesions must undergo biopsy as they may metastasize
Basal cell carcinoma (rodent ulcer)Low-grade malignant lesion due to a locally invasive epidermal tumour, with a pearly raised edge and a tendency to central ulceration; these lesions must be biopsied as they may metastasize
Malignant melanomaVirulent skin tumour, with 30% of incidence involving lower limb, most commonly occurring after 40 years of age in areas of sun-exposed or non-sun-exposed skin; lesions classically are raised, itchy, may bleed and show an irregular border and irregular pigmentation and/or Hutchinson's sign; these lesions must be biopsied as they may metastasize

ro·dent ul·cer

(rō'dĕnt ŭl'sĕr)
A slowly enlarging ulcerated basal cell carcinoma, usually on the face.

rodent

a member of the order Rodentia. Includes rats and mice and allied species, the squirrels and beavers, the porcupines and their related species, and the African mole rat in four separate suborders.

rodent bot
rodent ulcer
see eosinophilic ulcer.

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.
References in periodicals archive ?
Although he didn't have malignant melanoma, a rodent ulcer would have become trickier to deal with if it had been left untreated.
Rodent ulcer (basal cell carcinoma) is one of the commonest of all cancers and one of the least dangerous.
I HAVE had two rodent ulcers removed from my face in the last 18 months and have now been told that I've got another one growing on my neck.