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Early therapeutic radiation reactions
• Occur during or shortly after completion
• Due to rapid cell loss
• Associated with oedema and exudation
• Seen in skin, gastrointestinal tract and
bone marrow
• Repair due to cell renewal via intact basal
cells
• Healing usually complete but can result in
consequential late reactions
. Seen in skin,
bladder and oral mucosa when persistent
damage remains long-term after severe
acute damage