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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