Giant Cell Arteritis affects which size vessels?

Giant Cell Arteritis affects which size vessels?

• A. Small
• B. Medium and Large
• C. Micro
• D. Large only

Answer: (B)

Giant cell arteritis is a vasculitis that predominantly involves medium- and large-sized arteries rather than the smallest vessels. The inflammatory process targets arteries such as the temporal artery and other branches of the external carotid, and can extend into portions of the aorta. The pathology shows granulomatous inflammation with giant cells in the vessel wall, leading to thickening and luminal narrowing. This size-selective involvement explains why symptoms arise from ischemia in those regions, including potential vision loss when the ophthalmic artery is affected. Small-vessel involvement is not the primary pattern in this disease, which distinguishes it from microvascular vasculitides. For context, another large-vessel vasculitis, Takayasu arteritis, also affects large vessels but typically presents in younger individuals. So, the condition most commonly affects medium- and large-sized vessels.

Giant cell arteritis is a vasculitis that predominantly involves medium- and large-sized arteries rather than the smallest vessels. The inflammatory process targets arteries such as the temporal artery and other branches of the external carotid, and can extend into portions of the aorta. The pathology shows granulomatous inflammation with giant cells in the vessel wall, leading to thickening and luminal narrowing. This size-selective involvement explains why symptoms arise from ischemia in those regions, including potential vision loss when the ophthalmic artery is affected. Small-vessel involvement is not the primary pattern in this disease, which distinguishes it from microvascular vasculitides. For context, another large-vessel vasculitis, Takayasu arteritis, also affects large vessels but typically presents in younger individuals. So, the condition most commonly affects medium- and large-sized vessels.