eMedicine Specialties > Dermatology > Diseases of the Vessels
Temporal (Giant Cell) Arteritis
Updated: May 29, 2009
Introduction
Background
Temporal arteritis (TA), also known as cranial arteritis or giant cell arteritis, was first clinically recognized in 1890 when Hutchinson described an 80-year-old man whose painful inflamed temporal arteries precluded his wearing a hat. In 1932, Horton et al correlated the histopathologic features with the clinical features and applied the name arteritis temporalis. Other names include arteritis cranialis, Horton disease, granulomatous arteritis, and arteritis of the aged.
Since Horton's first description of temporal arteritis in the United States, this form of systemic vasculitis has become more widely recognized, as has the potential for serious sequelae, such as blindness and death. In 1960, Paulley and Hughes described the broad clinical spectrum and variable manifestations of the disease. Temporal arteritis is the most common form of systemic vasculitis in adults. Temporal arteritis primarily affects medium-sized arteries of the head and the neck. Most signs and symptoms reflect this distribution and include visual disturbances, headache, jaw claudication, neck pain, and scalp tenderness.
Although varied histopathologic findings have been noted over the years, temporal artery biopsy (TABx) remains the criterion standard for diagnosis of this granulomatous vasculitis. Until discovery of the anti-inflammatory properties of corticosteroids, patients with temporal arteritis received only supportive symptomatic treatment. Since 1950, steroids have revolutionized the treatment of the disease. Treatment with systemic corticosteroids produces a predictable clinical response and may prevent permanent visual loss, the most feared ischemic complication of the vasculitis.
Pathophysiology
The exact etiology of temporal arteritis remains unknown, although it is T-cell dependent and antigen driven. Temporal arteritis is classified as a systemic vasculitis, although it primarily affects the extracranial large and medium muscular arteries of the head and the neck. Both renal arteritis and aortic arteritis are rare. The vasculitis primarily damages the media and destroys the internal elastic layer. A panarteritis develops, and intimal proliferation causes luminal occlusion. The granulomatous infiltrate is largely mononuclear and consists primarily of polyclonal CD4+ T cells and macrophages. Of these lesions, 50% contain giant cells clustered near the disrupted internal elastic lamina.Studies by O'Brien and Regan1 have focused on the pathophysiologic role of actinic damage in persons with temporal arteritis. Chronic solar damage to elastic fibers may initiate an elastase-mediated degradation of the internal elastic lamina in temporal arteries, which may evoke an autoimmune response, resulting in granulomatous vasculitis.
The model of pathogenesis developed by Weyand and Goronzy2 proposes that an as yet undetermined antigen is first encountered in the adventitia. T cells localized to this layer are activated and produce interferon gamma, which stimulates macrophage differentiation and migration. Giant cells are formed and secrete growth factors and metalloproteinases that ultimately degrade the internal elastic lamina and produce occlusive luminal hyperplasia. Potential antigens include elastin, viral or bacterial epitopes, and other extracellular matrix proteins.
Finally, numerous studies now suggest that temporal arteritis consists of various clinical subsets rather than one uniform disease. Variable expression of different cytokine profiles likely determines the clinical manifestations. Tumor necrosis factor (TNF) and, more recently, interleukin 6, have been recognized to may play a major role in the pathophysiology of temporal arteritis.3
Frequency
United States
Temporal arteritis is one of the most prevalent of the systemic vasculitis syndromes, with an estimated prevalence of 200 cases per 100,000 people older than 50 years and an incidence of 20-30 new cases per 100,000 persons older than 50 years. Although the condition had been considered less common among Hispanic persons, recent evidence has challenged this notion.
International
The incidence, age, and sex distribution in northern Europe is similar to that in the United States, likely because of immigration patterns. Latitude is an important risk factor, with a prevalence in Sweden twice that of Spain or Italy.
Mortality/Morbidity
Mortality from temporal arteritis is extremely uncommon, especially with timely diagnosis and treatment. In 1972, Wilkinson and Russell4 reviewed 12 autopsy cases and reported a high prevalence of severe involvement of the superficial temporal, vertebral, ophthalmic, and posterior ciliary arteries and less frequent severe disease of the internal carotid, external carotid, and central retinal arteries. Intracranial arteries were never involved.
These patients, who died during the active phase of temporal arteritis, demonstrated a high prevalence of monocular blindness, occipital blindness, and brainstem strokes. Insignificant vasculitis was rarely identified in aortic, suprarenal, and coronary arteries and did not contribute to death. A close correlation existed between the amount of elastic tissue in susceptible arteries and the severity of the vasculitis. Subsequent morbidity and mortality from temporal arteritis reflect this anatomical distribution of vessels.
An insidious onset of the disease usually progresses to include fatigue, malaise, fever, weight loss, polymyalgia rheumatica, and flulike symptoms. Headache, scalp tenderness, focal arterial tenderness, jaw claudication, and visual loss may develop, and these findings indicate vascular involvement.
Race
Temporal arteritis primarily affects whites, specifically those of northern European descent. Scandinavians have the highest prevalence, and temporal arteritis is rare in African Americans. The gene for HLA-DRB1-04 has been identified as a risk factor for temporal arteritis. Although the condition had been considered less common among Hispanic persons, recent evidence has challenged this notion.
Sex
Females are affected in 80% of cases. Smoking increases the temporal arteritis risk 6-fold in women, while diabetes reduces the risk by half.
Age
Temporal arteritis is extremely uncommon in younger age groups. The average age at onset is in the sixth to seventh decade of life, with a mean age at onset of 69 years. It affects the same older population as the commonly associated polymyalgia rheumatica.
Clinical
History
- Temporal arteritis often manifests in an insidious manner with vague constitutional symptoms such as malaise, weight loss, fever, and fatigue.
- The classic manifestations are fever, anemia, headache, and an elevated erythrocyte sedimentation rate (ESR).
- Polymyalgia rheumatica (PMR) may develop either before or after the arteritis.
- Disease onset may also be abrupt. The diagnosis should be strongly suspected in whites older than 50 years of northern European descent, especially women, who report temporal headache, tender scalp, jaw claudication, and/or visual changes.
- Visual disturbances include diplopia, blurred vision, amaurosis fugax, and blindness in either one eye or both eyes.
- Symptoms signaling peripheral neuropathy or aortic involvement are rare.
- A history of chronic sun exposure may be relevant.
- In 2003, Amor-Dorado et al5 reported a previously unrecognized high incidence of audiovestibular disturbances such as vestibular dysfunction and/or hearing impairment in their temporal arteritis patients. Another rare complication involved lower extremity involvement with rapidly progressive claudication signaling compromised vascular flow. Surgery was often required.
Physical
- The examination should include an assessment of vital signs and blood pressure in both arms to rule out aortic arch involvement.
- The scalp may be focally or generally tender. Temporal arteries may be tender, inflamed, dilated, thickened, or cordlike.
- The arteries may be pulsatile, particularly early in the disease course.
- Bruits may signal partial occlusion.
- In severe cases, scalp skin or oral mucosal ulceration develops.
- Neurologic examination may reveal a neuropathy.
- Ophthalmologic examination reveals ischemic optic neuropathy in early stages of the disease and optic atrophy later in the disease course. Immediate referral is critical to ensure prompt diagnosis of reversible retinal ischemia from ophthalmic or posterior ciliary artery involvement.
- Audiovestibular examination may be considered.
Causes
The exact etiology of temporal arteritis remains unknown. See Pathophysiology.
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References
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Further Reading
Keywords
temporal arteritis, giant cell arteritis, arteritis temporalis, arteritis cranialis, Horton disease, Horton's disease, granulomatous arteritis, arteritis of the aged, cranial arteritis, systemic vasculitis, TA, giant cell arteritis, temporal arteritis
Overview: Temporal (Giant Cell) Arteritis