ghost tangle
A neurofibrillary tangle that persists after the death of its host neuron, appearing as an extracellular structure.
Full Definition
A ghost tangle represents the extracellular remnant of a neurofibrillary tangle following neuronal death. When a tangle-bearing neuron degenerates, the tau protein aggregate remains in the tissue as an extracellular structure, maintaining the characteristic paired helical filament morphology but lacking the surrounding neuronal cytoplasm. Ghost tangles are particularly abundant in advanced Alzheimer's disease and serve as indicators of significant neuronal loss. They can be distinguished from intracellular tangles by their location and the absence of surrounding cellular material in routine histological preparations.
Usage
Usage note: Indicates end-stage neuronal pathology; distinguish clearly from intracellular tangles.
In Context
- "Numerous ghost tangles were scattered throughout the CA1 pyramidal layer, indicating substantial neuronal loss." — Alzheimer's disease case report
- "The ratio of ghost tangles to neurofibrillary tangles suggested advanced stage pathology." — Quantitative assessment