Which late effect is a known consequence of cranial irradiation in childhood cancer survivors?

Which late effect is a known consequence of cranial irradiation in childhood cancer survivors?

• A. Leukoencephalopathy
• B. Cardiomyopathy and arrhythmias
• C. Obesity and gonadal dysfunction
• D. Peripheral neuropathy and hearing loss

Answer: (A)

Cranial irradiation in a developing brain preferentially damages white matter, so the late effect most characteristic of this treatment is leukoencephalopathy. Radiation injures oligodendrocytes and the brain's microvasculature, leading to demyelination and gliosis in the white matter. Clinically, this manifests years after therapy as slower processing speed, problems with attention and executive function, and learning difficulties, with imaging often showing diffuse white matter changes near the ventricles. The other potential late effects listed are more tied to radiation or treatments affecting other parts of the body (such as chest irradiation or certain chemotherapies causing heart disease, pelvic or total-body irradiation causing endocrine issues like obesity or gonadal dysfunction, and neurotoxic regimens causing neuropathy or hearing loss), making leukoencephalopathy the most consistent late consequence of cranial irradiation in childhood.

Cranial irradiation in a developing brain preferentially damages white matter, so the late effect most characteristic of this treatment is leukoencephalopathy. Radiation injures oligodendrocytes and the brain's microvasculature, leading to demyelination and gliosis in the white matter. Clinically, this manifests years after therapy as slower processing speed, problems with attention and executive function, and learning difficulties, with imaging often showing diffuse white matter changes near the ventricles. The other potential late effects listed are more tied to radiation or treatments affecting other parts of the body (such as chest irradiation or certain chemotherapies causing heart disease, pelvic or total-body irradiation causing endocrine issues like obesity or gonadal dysfunction, and neurotoxic regimens causing neuropathy or hearing loss), making leukoencephalopathy the most consistent late consequence of cranial irradiation in childhood.