Temporal Artery Biopsy
Giant cell arteritis (GCA) is a systemic vasculitis involving the large and medium-sized arteries of the cranial arteries coronary arteries common and internal carotid arteries and aorta and extracranial arteries. The diagnosis of GCA is made on the basis of symptoms, clinical findings and laboratory results however biopsy of the temporal artery is considered the gold standard to confirm GCA. Often a positive biopsy result is not only confirmatory of the diagnosis but also justifies long term steroid use in patients with a high chance of immunosuppressive related morbidity.
Typical histopathological interpretations of biopsies include active arteritis, healed arteritis, arteriosclerosis and atherosclerosis or normal. Changes in active arteritis include granulomatous inflammation, presence of giant cells, destruction of elastic fibers, splitting and fragmentation of the internal elastic lamina and deposition of calcium salts into the area of the internal elastic lamina as well as diffuse inflammation of the vessel wall and ingrowth of capillaries. Healed arteritis encompasses changes including irregular intimal thickening, intimal and medial fibrosis, focal areas of persistent chronic inflammation, confluent loss of the elastic lamina and medial neovascularization.
Temporal artery biopsy (TAB) remains the gold standard for diagnosis of GCA and aids in decision-making regarding long-term steroid use. The superficial temporal artery is the most common artery sampled however alternative accessible arterial sites such as the facial or occipital arteries may be used.
Color duplex sonography (CDS) is the imaging modality of choice to assist in the diagnosis and shows a hypoechoic halo around the lumen of the temporal artery, with unilateral halo having an 82% sensitivity and 91% specificity for GCA and bilateral halos having 100% specificity. CDS-guided TAB may be performed however it does not increase TAB sensitivity as inflamed portions of the artery may be detected by physical examination.
A majority of clinicians recommend initial unilateral TAB however some advocate for initial bilateral and others recommend deciding based on clinical suspicion. The rate of discordant biopsies in patients with initial bilateral temporal artery biopsy (1 side negative, 1 side positive) and discordance between localization of symptoms and side of positive biopsy has led to recommendations for initial bilateral temporal artery biopsy.
Due to the segmental nature of GCA, sufficient specimen length is important for accurate diagnosis, and the length of biopsy has been controversial in the literature. A 1-2 cm biopsy in vivo may be sufficient; however, the clinician should account for shrinkage of about 10% with fixation alone and plan for a biopsy of >2 cm to increase the accuracy of diagnosis 
Temporal artery biopsies are usually performed under local anesthesia if there are no contraindications. The superficial temporal arteries are palpated bilaterally to assess for patency and signs of arteritis. If the vessel is not easily palpable, hand-held Doppler can be used to localize it. Once the artery is identified, the surgical site is marked. A patent artery is preferred however a thrombosed artery can show histopathological signs of GCA as well and can be pursued.
Topical lidocaine can be applied prior to lidocaine infiltration. The area is prepared by clipping any hair if present and scrubbed with either povidone iodine or chlorhexidine gluconate and draped in the usual sterile fashion. Local anesthesia with a combination of short and long acting anesthetic (1:1 mixture of 2% lidocaine with epinephrine (1:200,000) and 0.5% bupivacaine with epinephrine (1:200,000) is injected into the skin and subcutaneous tissues approximately 1 cm lateral to the site of the artery, on either side. Using a Bard-Parker #15 scalpel and gentle lateral traction, a vertical incision is made overlying the marked temporal artery just through the dermis. The subcutaneous fat in this area is usually minimal and occasionally the artery can be visualized at this point. The incision should provide enough exposure to easily see approximately 3 cm of the vessel, this can be facilitated by the use of a self-retaining retractor or skin hooks. Fine, blunt scissors are used to separate the thin layer of subcutaneous fat and expose the superficial temporal fascia. The fascia is elevated with toothed forceps and penetrated with scissor tips. The incision is then expanded to expose the superficial temporal artery, if not readily visible the area may be palpated or a Doppler probe can be used intraoperatively. The surgeon should minimize manipulation of the artery as much as possible as arterial spasm may occur which can cause histologic artifact. Three centimeters of the artery is dissected and isolated. Placement of a vessel loop or silk suture can aid in elevating and stabilizing the artery during dissection. A specimen of at least 2 cm in vivo should be harvested.
The artery is ligated proximally and distally or small heomstats are used to clamp proximally and distally and the intervening segment is removed with tenotomy scissors. The arterial stumps are ligated with non-absorbable sutures and hemostasis is assisted with pressure, electrocautery and/or topical agents. The wound is irrigated, braided absorbable sutures are used to close the subcutaneous tissues and absorbable, monofilament suture in the skin. Adhesive skin strips and nonadherent, absorbable dressing are placed and covered with self-adhesive film dressing.
The procedure is generally performed in the outpatient setting and patients are instructed on home wound care. The dressing over the biopsy site should be maintained for 24 hours after which time the outer self-adhesive film can be removed. The inner adhesive strips should remain in place and the patient should avoid this area while bathing.
- Nerve damage
- Wound dehiscence
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