spongiform change
Characteristic vacuolar degeneration of neuropil creating a sponge-like appearance in prion diseases.
Full Definition
Spongiform change refers to the pathognomonic vacuolation of brain tissue that creates a distinctive sponge-like microscopic appearance, most notably seen in prion diseases such as Creutzfeldt-Jakob disease. These vacuoles form within neuronal processes and neuropil, representing areas of membrane disruption and cellular degeneration. The pattern and distribution of spongiform change helps differentiate between various prion diseases and other neurodegenerative conditions. This finding is considered essential for the histopathological diagnosis of transmissible spongiform encephalopathies.
Usage
Usage note: Must be distinguished from artifactual vacuolation due to processing issues.
In Context
- "Prominent spongiform change was observed in the cortical grey matter, supporting a diagnosis of prion disease." — Autopsy report
- "The spongiform change pattern was most severe in the temporal and occipital cortices." — Neuropathological assessment