Long-term treatment of Langerhans cell histiocytosis of the mandibular condyle with indomethacin.

Langerhans cell histiocytosis (LCH) most commonly occurs as a localized solitary bone lesion and appears predominantly in pediatric patients. LCH is characterized by the proliferation and accumulation of Langerhans cells which may cause pain and adjacent soft-tissue swelling. This disease is of clinical importance to dental professionals because LCH commonly involves the oral and maxillofacial region and early symptoms can be manifested in the jaw and, when overlooked, may result in extensive destruction of the involved structures. Considering the fact that this is a relatively rare entity, close investigation of the cases that are encountered are warranted. Herein we report a case of LCH occurring in the left condyle of an 11-year-old boy that initially showed clinical symptoms mimicking an abscess of the temporomandibular joint. The clinical and radiographic features, differential diagnosis, treatment, and long-term follow-up of this patient with indomethacin are presented.