cortical tuber
Dysplastic cortical lesions characteristic of tuberous sclerosis complex, featuring enlarged dysmorphic neurons and balloon cells.
Full Definition
Cortical tubers are pathognomonic lesions of tuberous sclerosis complex (TSC), representing areas of cortical dysplasia with characteristic histopathological features. These lesions consist of disorganized cortical architecture with the presence of dysmorphic neurons that are enlarged and show abnormal morphology, and balloon cells which are large, eosinophilic cells with unclear lineage. The normal six-layered cortical organization is disrupted, and there is often increased cellularity with a mixed population of neurons, astrocytes, and the distinctive balloon cells. Immunohistochemically, balloon cells may show variable expression of neuronal and glial markers, reflecting their uncertain differentiation status. The lesions are associated with mutations in TSC1 or TSC2 genes, leading to mTOR pathway activation. Cortical tubers are epileptogenic and may require surgical resection in medically refractory cases. The presence of these lesions in brain tissue is diagnostic of tuberous sclerosis complex when accompanied by appropriate clinical features.
Usage
Usage note: Key diagnostic feature of tuberous sclerosis complex; ensure balloon cells and dysmorphic neurons are specifically described.
In Context
- "The resected temporal lobe tissue showed typical features of a cortical tuber with dysmorphic neurons and scattered balloon cells." — Epilepsy surgery report
- "Histological examination revealed loss of normal cortical lamination consistent with a cortical tuber, supporting the diagnosis of tuberous sclerosis complex." — Surgical pathology report