Grade 3 Moist Desquamation in the Inframammary Fold During Whole Breast Radiotherapy
A 54-year-old woman is receiving adjuvant whole breast radiotherapy after lumpectomy for a 2.1 cm hormone receptor-positive left breast cancer: 50 Gy in 25 fractions to the whole breast followed by a 10 Gy in 5 fraction lumpectomy bed boost, using tangential fields with a daily 5 mm bolus over the incision. At fraction 18 she shows the therapist a 4 x 6 cm area of confluent moist desquamation in the inframammary fold, with pain 6/10, and says she can no longer wear a bra. She works outdoors as a landscape gardener and has been gardening on weekends. She has no fever and no chills, and the surrounding skin is erythematous but not indurated beyond the radiation field. She asks whether she can stop treatment for a week because of a family wedding.
1. How would you grade this reaction, and what is your immediate management? Include what you would tell her about continuing treatment.
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This is grade 3 moist desquamation by RTOG/EORTC criteria: confluent, weeping epidermal loss beyond the skin folds, with moderate to severe pain. It is not grade 2, which would be patchy, moist desquamation confined to the fold, because the area here is 4 x 6 cm and confluent.
Immediate management is skin care plus symptom control. Cleanse gently with lukewarm saline or water, pat dry, and apply a non-adherent dressing with a hydrogel or a product such as silver sulfadiazine where the physician agrees. Avoid alcohol, perfumes, adhesive tape over the broken skin, and tight clothing. Give analgesia, since pain at 6/10 interferes with sleep and with her willingness to continue. Keep the fold dry; a soft cotton barrier or a bra liner helps.
On continuation: a brief treatment break is a physician decision, not a therapist decision, and it is usually not required for grade 3 desquamation alone. The better course is usually to continue, with the physician reviewing whether the bolus is still needed over the broken skin, since bolus builds dose in the epidermis where the injury already is. If a break is taken, it is typically short and documented with a plan to complete the dose. Tell her honestly that the reaction will peak about one to two weeks after the last fraction and then heal, and that stopping for a week would prolong the overall course without reliably relieving the peak.
2. Which findings would make you escalate to the physician immediately rather than manage with routine skin care?
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Any suggestion that this is now an infection or a deeper process rather than a radiation reaction. Fever of 38.3 degrees Celsius or higher, chills, or malaise; spreading erythema beyond the treatment field; induration, fluctuance, or a foul or purulent exudate; pain disproportionate to the visible skin change; or a rapidly enlarging area between visits.
Also escalate if she develops skin breakdown over the lumpectomy incision with dehiscence, if she reports swelling of the arm suggesting lymphedema or cellulitis, or if pain is uncontrolled with the prescribed analgesia. Her outdoor work is a relevant risk factor for secondary infection and for further skin irritation, and it belongs in the note.
For anything on that list, the therapist contacts the radiation oncologist the same day rather than giving more skin-care advice. The distinction matters because radiation dermatitis is expected and managed supportively, while cellulitis in a patient on chemotherapy or with a prosthesis can deteriorate quickly.
3. What would you document, and what education would you give about the boost, sun exposure, and when to call?
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Document the date, the anatomic location, the measured size, the grade, the pain score, the products applied, the dressing, the analgesia, the physician notification, and what the patient was advised. Use photography only if the department policy allows it and the patient consents.
Education should be specific. The boost targets the lumpectomy bed, so the skin reaction may worsen in that smaller area even as the whole-breast reaction begins to settle; this is expected and is not a sign that something has gone wrong. Sun exposure is a real risk for her job: keep the treated breast covered with fabric, not just sunscreen, while the skin is broken, and avoid gardening in the middle of the day when sweating and friction are worst. Avoid hot water bottles, heating pads, and tight bra straps over the fold. Keep the area clean and dry, and do not pick at peeling skin.
Tell her exactly when to call: fever, spreading redness, pus or foul odor, worsening pain despite analgesia, or any new breakdown of the incision. Give her a direct number and a named contact. Write the advice in the chart so the next therapist reinforces the same message.