An 80-year-old female present with progressive loss of memory, difficulty in recalling names, difficulty in speech and irritability. Along with neurofibrillary tangles what will be found in the brain –
First, I need to recall the pathology of Alzheimer's disease. Alzheimer's is characterized by two main histological features: neurofibrillary tangles and amyloid plaques. The tangles are made of hyperphosphorylated tau protein, which disrupts the microtubules in neurons. The plaques consist of beta-amyloid protein deposits. So, the correct answer here should be amyloid plaques.
Looking at the options (even though they're not listed), the other options might include things like Lewy bodies (Parkinson's), Pick bodies (Pick's disease), or other lesions. The key is that Alzheimer's has both tangles and plaques. So the correct answer is amyloid plaques. The other options are for different diseases. For example, Lewy bodies are in Parkinson's and Dementia with Lewy Bodies. Pick bodies are in Frontotemporal Dementia. So I need to make sure the explanation highlights that the combination of tangles and plaques is specific to Alzheimer's.
**Core Concept**
Alzheimer's disease is characterized by the presence of **neurofibrillary tangles** (intracellular aggregates of hyperphosphorylated tau protein) and **amyloid-beta plaques** (extracellular deposits of misfolded amyloid-beta peptides). These pathological hallmarks disrupt neuronal function and lead to cognitive decline.
**Why the Correct Answer is Right**
The question asks for the histopathological finding associated with neurofibrillary tangles in Alzheimer’s disease. **Amyloid-beta plaques** are the key extracellular lesions paired with intracellular tangles. Amyloid-beta is derived from the amyloid precursor protein (APP) via proteolytic cleavage by beta- and gamma-secretases. Plaques trigger neuroinflammation, oxidative stress, and synaptic dysfunction, synergizing with tangles to cause neuronal death.
**Why Each Wrong Option is Incorrect**
**Option A:** *Lewy bodies* (Parkinson’s/dementia with Lewy bodies) are intracellular alpha-synuclein aggregates, not seen in Alzheimer’s.
**Option B:** *Pick bodies* (Pick’s disease) are tau-positive inclusions in frontotemporal dementia, but lack amyloid-beta involvement.
**Option C:** *Hirano bodies* are actin-rich inclusions in hippocampal neurons, associated with aging but not specific to Alzheimer’s.
**Clinical Pearl / High-Yield Fact**
**Alzheimer’s = Tangles + Plaques**: Always pair neurofibrillary tangles (tau) with amyloid-beta plaques. For exams, remember **“3 A’s”**: **A**myloid plaques, **A**ngiopathy, and **A**lzheimer’s disease.
**Correct Answer: D. Amyloid-beta plaques**