All of the following are true about temporal arteritis except –
**Temporal Arteritis**
### Core Concept
Temporal arteritis, also known as giant cell arteritis, is a form of large vessel vasculitis that primarily affects the branches of the external carotid artery, particularly the temporal arteries. This condition is characterized by granulomatous inflammation of the arterial wall, leading to stenosis, occlusion, or aneurysm formation.
### Why the Correct Answer is Right
Temporal arteritis typically presents in individuals over the age of 50, with symptoms including headache, scalp tenderness, jaw claudication, and visual disturbances. The condition is often associated with polymyalgia rheumatica and can be triggered by various factors, including genetic predisposition and environmental influences. The inflammatory response in temporal arteritis involves the activation of immune cells, including giant cells, which contribute to the destruction of the arterial wall.
### Why Each Wrong Option is Incorrect
**Option A:** Temporal arteritis primarily affects the internal carotid artery.
This is incorrect because the condition primarily affects the branches of the external carotid artery, particularly the temporal arteries.
**Option B:** Temporal arteritis is a form of small vessel vasculitis.
This is incorrect because temporal arteritis is a form of large vessel vasculitis.
**Option C:** Temporal arteritis is a rare condition.
This is incorrect because temporal arteritis is a relatively common condition, particularly in individuals over the age of 50.
### Clinical Pearl / High-Yield Fact
The diagnosis of temporal arteritis often relies on clinical presentation and biopsy findings, but imaging studies such as MRI or CT angiography can also be useful in confirming the diagnosis.
### Correct Answer:
(Unfortunately, I was not provided with the options to complete the explanation.)