All of the following are true of giant cell arteritis (GCA) or temporal arteritis except one. Which is the exception?

The statement regarding the temporal artery being constricted with increased pulsatility is not accurate in the context of giant cell arteritis (GCA). In GCA, the inflammation of the temporal artery typically leads to edema and thickening of the vessel walls, resulting in a less prominent or pulseless artery rather than one that is constricted yet pulsatile.

In contrast, the aching or cramping sensation in the masseter or temporal muscle reflects the ischemic pain often experienced by patients due to reduced blood flow resulting from the arteritis, and it is a common symptom associated with this condition.

Blindness is a serious and well-documented complication of GCA, often occurring due to occlusion of the central retinal artery, which can result in irreversible vision loss if not treated promptly.

Temporal artery biopsy is indeed the definitive diagnostic test for GCA, as it allows for direct visualization and histopathologic examination of the vessel wall, confirming the presence of giant cells and inflammation, which are characteristic of this condition.