The study aims at measuring the sensitivity and specificity of a series of imaging signs (recorded by magnetic resonance angiography, vascular tomodensitometry, vascular ultrasonography, retina angiography and retina optic coherence tomography) for the diagnosis of Horton disease, the gold standard being the result of temporal artery biopsy.

Inclusion Criteria:

• Patients admitted to the Fondation Ophtalmologique Adolphe de Rothschild and suspected to suffer from Horton disease, based on the presence of 3 or more major criteria, or 2 major criteria and at least one minor criteria.

Major criteria : Age > 50 ans ; headache ; intermittent jaw or tongue pain ; visual impairment ; ESR > 50 mm at 1h and/or CRP > 8mg/l.

Minor criteria: temporal artery or scalp tenderness ; facial pain or tenderness ; fever >38°C, weight loss >10%, anorexia, fatigue.

Exclusion Criteria:

• Autoimmune disease
• Active infectious condition
• Malignant disease
• Condition counterindicating one or several of the protocol's imaging procedures : allergy to iodine and/or renal insufficiency and/or claustrophobia and/or metallic foreign body...

Patients admitted to the Fondation Ophtalmologique Adolphe de Rothschild with a suspected Horton disease