Autopsy report of a late delayed radiation injury after a period of 45 years.

For delayed radiation injury, image analysis has considerably advanced, but neuropathological findings are still required to establish diagnosis. A patient who had received radiation therapy for pineal germinoma at age 14 developed neurological and psychiatric abnormalities after 15 years as a late delayed radiation injury. Autopsy at age 59 revealed diffuse changes in the white matter consisting in order of severity of myelin pallor, demyelination, and necrosis which were characterized by a lack of glial reaction. The cerebral cortex was relatively well preserved. As delayed radiation injuries, hyalinous changes in the vascular wall, angiomatous lesions and, fresh and old petechial hemorrhages were found. Moreover, vascular changes associated with arteriosclerosis were also present. Furthermore, a focal glial nodule was detected which was considered to be a new radiation-induced neoplasia. These findings suggest that late delayed radiation injury may slowly develop over 30 years and may involve damage to neuroglial stem cell compensation. It is also evident that arteriosclerotic changes and newly induced neoplasia may develop in delayed radiation injury cases.
(© 2019 Japanese Society of Neuropathology.)