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Osteoradionecrosis — SCE Medical Oncology MCQ

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ModerateHead & Neck CancerOsteoradionecrosisSCE Medical Oncology

A 62-year-old man with head and neck SCC develops osteoradionecrosis of the mandible 18 months after completing radical chemoradiotherapy. He has exposed bone and pain. What is the specific pathological mechanism and initial management?

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Correct answer: E — Radiation-induced hypoxic, hypocellular, hypovascular tissue with impaired healing — initial management includes conservative measures (antibiotics, hyperbaric oxygen consideration, oral hygiene), progressing to surgical debridement/reconstruction if refractory

Osteoradionecrosis (ORN) results from radiation-induced damage to bone vasculature, creating hypoxic, hypocellular and hypovascular tissue with impaired healing capacity (Marx's 3H theory). Initial management is conservative: antibiotics (for secondary infection), meticulous oral hygiene, avoidance of further trauma, and pentoxifylline + tocopherol (PENTOCLO regimen). Hyperbaric oxygen therapy is debated but may help in selected cases. Refractory ORN requires surgical debridement and free flap reconstruction. Prevention (pre-radiation dental assessment) is key.

Reference: NICE NG36; ESMO 2024 Head and Neck Cancer Supportive Care; Marx et al J Oral Maxillofac Surg 1983