Plaque-like structures and arteriosclerotic changes in "diffuse neurofibrillary tangles with calcification" (DNTC).

Area of Science:

• Neuropathology
• Neurodegenerative Diseases
• Vascular Dementia

Background:

• Diffuse neurofibrillary tangles with calcification (DNTC) is a rare dementia.
• It presents with fronto-temporal atrophy, neuronal loss, astrocytosis, neurofibrillary tangles, and Fahr-type calcification, notably lacking senile plaques.

Purpose of the Study:

• To identify novel histopathological abnormalities in DNTC.
• To investigate the presence and characteristics of plaque-like structures (PLS) in DNTC.
• To evaluate arteriosclerosis and white matter lesions in DNTC patients.

Main Methods:

• Histopathological examination of brain tissue from DNTC patients.
• Detection and characterization of "plaque-like structures" (PLS) using various stains (e.g., methenamine silver).
• Assessment of medullary artery sclerosis and white matter lesions, compared to age-matched controls.

Main Results:

• A novel abnormality, "plaque-like structures" (PLS), was identified in DNTC patients.
• PLS are oval, eosinophilic masses associated with small vessels and astrocytes, composed of unique fiber types not seen in Alzheimer's disease.
• Significant medullary artery sclerosis and white matter lesions were observed in DNTC patients, independent of hypertension or beta-amyloid.

Conclusions:

• Plaque-like structures (PLS) represent a unique histopathological feature of diffuse neurofibrillary tangles with calcification (DNTC).
• Arteriosclerosis and white matter lesions are prominent features in DNTC, contributing to the disease pathology.
• DNTC pathology is distinct from Alzheimer's disease, highlighting its unique characteristics.