late effects
Radiation-induced complications occurring months to years after treatment completion.
Full Definition
Late effects refer to radiation-induced toxicities that develop months to years after completion of radiation therapy, distinguished from acute effects that occur during or shortly after treatment. These complications result from slowly proliferating tissues with long cell cycle times, including connective tissue, vasculature, and nervous system structures. Late effects can include fibrosis, secondary malignancies, growth impairment in children, cognitive dysfunction, and organ dysfunction. Unlike acute effects, late effects are typically irreversible and may be progressive over time. Risk factors include total dose, fractionation schedule, treatment volume, and patient age, with children being particularly susceptible to growth and developmental impacts.
Usage
Usage note: Distinguish from acute effects by timing and tissue response characteristics.
In Context
- "The patient developed pulmonary fibrosis as a late effect of thoracic radiation." — radiation oncology follow-up
- "Late effects monitoring includes annual cardiac evaluation for mediastinal radiation patients." — survivorship care plan