EFFECTS OF HEAD IRRADIATION IN NEWBORN RATS 71 



radiated animals. The neuropatholosic findings correlated closely with the 

 behavioral disturbances. Prominent among the early microscopic findings 

 was damage to capillaries. Later histopathologic findings included perivas- 

 culitis, progressive thickening of the \essel walls and a narrowing of the 

 vessel lumen, meningitis, inflammation of the choroid plexus, ventricular en- 

 largement, delayed cerebral cortical and cerebellar de\elopment. focal ne- 

 crosis, and gliosis. 



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