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Table 2 CTCAE criteria for skin toxicity

From: Acute radiodermatitis in modern adjuvant 3D conformal radiotherapy for breast cancer - the impact of dose distribution and patient related factors

Common Terminology Criteria for Adverse Events (CTCAE): Adverse effect grade Definition Dermatitis radiation: A finding of cutaneous inflammatory reaction occurring as a result of exposure to biologically effective levels of ionizing radiation.
II° III° IV°
Faint erythema or dry desquamation Moderate to brisk erythema; patchy moist desquamation, mostly confined to skin folds and creases; moderate edema Moist desquamation in areas other than skin folds and creases; bleeding induced by minor trauma or abrasion Life-threatening consequences; skin necrosis or ulceration of full thickness dermis; spontaneous bleeding from involved site; skin graft indicated Death