In Alzheimer&;s disease (AD) which of the following is not seen:
**Core Concept**
Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the accumulation of amyloid-beta plaques, neurofibrillary tangles, and neuronal loss in the brain, leading to cognitive decline and dementia. The pathophysiology of AD involves a complex interplay between genetic, environmental, and inflammatory factors.
**Why the Correct Answer is Right**
The correct answer is related to the characteristic neuropathological features of AD. Amyloid-beta plaques and neurofibrillary tangles are hallmarks of AD, whereas neuronal loss and synaptic dysfunction are consequences of the disease process. The correct answer represents a feature not typically associated with AD.
**Why Each Wrong Option is Incorrect**
**Option A:**
* Not a characteristic feature of AD, but rather a feature of frontotemporal dementia.
**Option B:**
* Actually seen in AD, as it is a result of neuronal loss and synaptic dysfunction.
**Option C:**
* Not typically seen in AD, as it is more commonly associated with other forms of dementia, such as vascular dementia.
**Clinical Pearl / High-Yield Fact**
A key feature of AD is the accumulation of amyloid-beta plaques, which can be detected using imaging techniques such as PET scans. This can aid in early diagnosis and monitoring of disease progression.
**Correct Answer:** C.