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[Delayed cerebral radionecrosis associated with brain edema].

S Shibata1, T Jinnouchi, K Mori

  • 1Department of Neurosurgery, Nagasaki University School of Medicine, Japan.

No Shinkei Geka. Neurological Surgery
|April 1, 1988
PubMed
Summary

Delayed cerebral radionecrosis involves ultrastructural capillary changes, leading to severe brain edema. Increased pinocytotic vesicles and endothelial gaps contribute to vessel permeability, causing brain swelling after radiotherapy.

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Area of Science:

  • Neurology
  • Oncology
  • Pathology

Background:

  • Cerebral radionecrosis is a delayed complication of radiotherapy, often presenting with severe brain edema.
  • Understanding the ultrastructural changes in cerebral capillaries is crucial for explaining the pathogenesis of radiation-induced brain injury.

Observation:

  • A patient with delayed cerebral radionecrosis, two and a half years post-radiotherapy for a meningioma, exhibited significant ultrastructural capillary abnormalities.
  • Capillary endothelial cells showed decreased electron density, reduced surface infolding, variable thickness, and a marked increase in pinocytotic vesicles (37/µm²).
  • Endothelial discontinuity, irregular basal laminae, enlarged pericapillary spaces with fibrin-like material, and inflammatory cell infiltration were observed, while tight junctions remained intact.

Findings:

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  • Activated pinocytotic vesicles (vesicular transport) are identified as a key mechanism increasing cerebral capillary permeability in delayed radionecrosis.
  • Endothelial discontinuity may also contribute to vascular leakage and subsequent brain edema.
  • The preserved tight junctions suggest that increased permeability is primarily mediated by transcellular rather than paracellular pathways.

Implications:

  • These findings elucidate the microvascular mechanisms underlying severe brain edema in delayed cerebral radionecrosis.
  • Targeting vesicular transport pathways could offer novel therapeutic strategies for managing radiation-induced brain injury.
  • Further research into endothelial cell responses to radiation is warranted to develop preventative and therapeutic interventions.