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Early delayed radiation encephalopathy occurs —— after irradiation
A. < 1 weeks
B. < 2 weeks
C. 2 weeks to 4 months
D .> 6 months
Acute radiation encephalopathy
Expressed in days to weeks after irradiation
Early delayed radiation encephalopathy
1–6 months post-irradiation
Delayed radiation encephalopathy
characterized histopathologically by vascular abnormalities, demyelination, and ultimately white matter necrosis is usually observed >6 months post-irradiation
| Radiation encephalopathy | Time period | Radiation doses | |
| 1 | Acute radiation encephalopathy | within a few days of exposure | > 3 Gy. |
| 2 | Early delayed radiation encephalopathy | 1–6 months post-irradiation | |
| 3 | Delayed radiation encephalopathy | > 6 months post-irradiation | > 35 Gy. |
Delayed radiation encephalopathy seen – when doses exceed 35 Gy.
