Giant cell reparative granuloma of the petrous temporal bone: A case report and literature review

Giant cell reparative granuloma (GCRG) is an unusual, benign bone lesion th at most commonly affects the maxilla and mandible; skull involvement is rar e. The etiology is uncertain but may be related to trauma. GCRG is difficul t to distinguish from giant cell tumor of the bone and has a lower recurren ce rate. Thirteen reports of temporal bone GCRG in 11 patients have been re ported. One report of a petrous GCRG in a 3-year-old girl has been identifi ed. A 38-year-old male presented with a 2-year history of fullness in his l eft ear, ipsilateral hearing loss, and intermittent cacosmia. Computed tomo graphy and magnetic resonance imaging revealed a large left-sided anterior temporal extradural mass. The patient underwent a left frontotemporal crani otomy and resection of a left temporal fossa turner that involved the petro us and squamous parts of the temporal bone. The patient's post-operative co urse was uneventful, except for increased hearing loss secondary to opening of the epitympanum. Follow-up at one month revealed no other problems. His topathology of the specimen was consistent with a giant cell reparative gra nuloma.