Temporal bone chondroblastomas.

OBJECTIVES To review temporal bone chondroblastomas in regards to their presentation, radiographic findings, histopathology, and treatment.Study design Case report and literature review. METHODS A case report of a 38-year-old man is reviewed who presented with left-sided mixed hearing loss, otalgia, otorrhea, and a left external auditory canal mass. A computed tomography scan revealed a 6-cm mass involving the petrous and squamous portions of the left temporal bone. CONCLUSIONS Temporal bone chondroblastomas are extremely rare osseous tumors with only 35 cases previously reported in the literature. Presenting symptomatology and pathology may be confused with more common lesions seen in the temporal bone. Diagnostic radiology, including computed tomography and/or magnetic resonance imaging, as well as immunohistochemical staining with S-100 protein may assist in making the diagnosis. Treatment is complete surgical excision with preservation of vital neurovascular structures.