Which procedure is used to confirm giant cell arteritis in the context of AAION?

Which procedure is used to confirm giant cell arteritis in the context of AAION?

• A. Temporal artery biopsy
• B. MRI brain
• C. CT angiography
• D. Ultrasound of the eye

Answer: (A)

The key idea is that confirming giant cell arteritis causing AAION relies on tissue diagnosis. A temporal artery biopsy provides direct histopathologic evidence of the vasculitis, showing granulomatous inflammation in the arterial wall with features like multinucleated giant cells and intimal hyperplasia. This histology is what establishes the diagnosis and guides treatment decisions. Imaging studies (like MRI or CT angiography) can reveal vascular or brain involvement and help assess extent, but they do not provide definitive histopathologic confirmation. Eye-focused ultrasound isn’t the standard confirmatory test for GCA, though temporal artery ultrasound can support the diagnosis in some contexts; it doesn’t replace biopsy. Keep in mind that biopsy can miss affected segments (skip lesions), so a negative result doesn’t completely rule out GCA if clinical suspicion remains high. In suspected cases, treatment with high‑dose steroids should not be delayed for biopsy results.

The key idea is that confirming giant cell arteritis causing AAION relies on tissue diagnosis. A temporal artery biopsy provides direct histopathologic evidence of the vasculitis, showing granulomatous inflammation in the arterial wall with features like multinucleated giant cells and intimal hyperplasia. This histology is what establishes the diagnosis and guides treatment decisions.

Imaging studies (like MRI or CT angiography) can reveal vascular or brain involvement and help assess extent, but they do not provide definitive histopathologic confirmation. Eye-focused ultrasound isn’t the standard confirmatory test for GCA, though temporal artery ultrasound can support the diagnosis in some contexts; it doesn’t replace biopsy.

Keep in mind that biopsy can miss affected segments (skip lesions), so a negative result doesn’t completely rule out GCA if clinical suspicion remains high. In suspected cases, treatment with high‑dose steroids should not be delayed for biopsy results.