Temporal artery biopsy is a useful tool helping to the diagnosis of giant cell arteritis. However, other diagnoses might be associated with abnormal temporal artery biopsy. The purpose of this study is to describe the frequency of giant cell arteritis differential diagnoses with positive temporal artery biopsy.

Inclusion Criteria:

• positive artery biopsy between january 1st 2000 and july 25th 2019

Exclusion Criteria:

• orther vascular biopsy than temporal artery biospy

all patients with significant inflammation on temporal artery biospy, with a final diagnosis of giant cell arteritis or an other diagnosis.