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Head and neck radiotherapy in children is associated with significant acute and late morbidities. Temporomandibular joint dysfunction and trismus has been widely reported in patients receiving radiotherapy for sarcomas and nasopharyngeal carcinoma; however, erosion of the mandibular condyle is a rare sequela of modern radiotherapy techniques. In this report, we present three cases of erosion of the temporomandibular joint amongst pediatric patients treated with radiotherapy for distinct head, neck and brain malignancies. Pediatr Blood Cancer 2014; 61:1479–1480. © 2014 Wiley Periodicals, Inc.