Radiotherapy Combined With Zoledronic Acid for Fibrous Dysplasia With a Central Giant Cell Granuloma: A Case Report.

Background: Giant cell reparative granulomas are nonneoplastic, benign lesions that can expand and dissolve bone. Fibrous dysplasia is a benign condition in which normal bone tissue is replaced by abnormally proliferating immature reticular bone and fibrous tissue. The combination of giant cell reparative granuloma and fibrous dysplasia is extremely rare and can pose diagnostic and therapeutic challenges because of the complexity of clinical presentation.

Case presentation: We here present a patient who had a combination of fibrous dysplasia of bone and a giant cell reparative granuloma. An elderly male was admitted to the hospital with a blood-streaked nasal discharge, blurry vision in his right eye, and an enlarged mass under the chin. A CT scan revealed that the lesion had infiltrated the head and face extensively, including the right maxillary sinus, sieve sinus, and the right nasal cavity, contraindicating surgery. The patient received a total dose of 30 Gy of 6 MV x-ray radiotherapy delivered through helical tomotherapy over 15 sessions, with a single dose of 2 Gy being administered five times a week. Concurrently, The dose is 4 mg of zoledronic acid administered intravenously once every 21 days. After treatment, the patient's nasal congestion was significantly relieved, the vision of the right eye improved, and the mandibular lesion was significantly reduced.

Conclusions: Treatment with radiotherapy combined with zoledronic acid for our patient's inoperable osteolytic giant cell reparative granuloma adjacent to vital nerves and blood vessels was extremely effective and safe. This case report provides a reference for the management of this rare combination.