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OBJECTIVES: Giant cell arteritis (GCA) may affect mid-size and large-size arteries. Although temporal arteritis is a well-characterized clinical entity, GCA of the thoracic aorta remains ill defined. The aim of the study was to evaluate the clinical presentation, surgical and mid-term outcomes in patients operated for GCA of the thoracic aorta. METHODS: A retrospective review of patients operated for GCA of the thoracic aorta was conducted. The diagnosis of GCA was established by the pathology report. RESULTS: Forty consecutive patients (mean age of 66.6 ± 9.1 years) with a diagnosis of GCA of the thoracic aorta were operated on. A history of polymyalgia rheumatica or temporal arteritis was positive in 22.5% of patients. Emergency surgery was performed in 10% of patients (3 'type A' dissections and 1 'type B'). Mega-aorta syndrome was present in 10% of patients. Involvement of the ascending aorta was present in 100% of patients. One patient had a previous branched thoracic endovascular replacement (TEVAR) with a type I proximal endoleak. In 4 patients, the thoracic aorta was totally replaced. Eighty-five percent of patients had an arch replacement; 79.4% a hemiarch and 20.6% a full arch. The mean circulatory arrest time was 16.3 ± 12.3 min. Eighty percent of patients had an aortic valve procedure; aortic valve replacement was performed in 50% of them and Bentall-De Bono/valve sparing in 50%. Cerebrovascular accident occurred in 2.5% of patients. No patient died during hospitalization. The mean hospital stay was 8.7 ± 3.0 days. The mean postoperative follow-up time was 4.2 ± 2.3 years, with a mean of 4.2 ± 2.2 thoraco-abdominal computed tomographies (CTs)/patient. Four patients had late reinterventions: 2 were valve-related, 1 for a distal type I endoleak treated with a distal TEVAR extension and 1 type II open thoraco-abdominal replacement for disease progression. One distal type I TEVAR endoleak was treated medically. Aortic diameter progressions on CT (mm/year) were 0.7 ± 1.0 mm for the arch, 1.2 ± 2.0 mm for the isthmus, 1.1 ± 1.7 mm for the mid-descending, 0.7 ± 0.9 mm for the aortic hiatus, 0.5 ± 0.5 mm for the supra-renal aorta and 0.6 ± 0.6 mm for the infra-renal aorta. One patient who declined reoperation on the descending aorta died suddenly 3 years after her initial operation. The 5-year overall survival rate was 91%. CONCLUSIONS: GCA of the thoracic aorta may be suspected in less than 25% of patients preoperatively. Clinical presentation may be acute or chronic with localized or diffused aortic involvement but always involved the ascending aorta. Surgery may be performed with excellent outcomes. Follow-up imaging is mandatory to assess aortic progression. [ABSTRACT FROM AUTHOR]