![]() ![]() Definitive distinction between osteomas and exostoses is by histopathology. In contrast, exostoses are smooth and broad-based, and are more likely to be bilateral. Radiologically, osteomas may be distinguished from exostoses by the presence of bone marrow as well as an acute protrusion into the IAC space. However, patients may be asymptomatic with the lesions only incidentally discovered on radiograph or upon autopsy. Associated symptoms include hearing loss, vestibular dysfunction, tinnitus, and facial spasms. Twenty one cases of osteomas and exostoses of the IAC have been reported with only six cases demonstrating bilaterally. ![]() Rarely, they are found in the internal auditory canal (IAC). When present, they are most commonly found in the calvarium, facial bones, and mandible. Osteomas and exostoses are benign tumors of bone with an estimated prevalence of 0.42%. In this report, we review the literature on bony lesions of the IAC and present two cases: one case of bilateral compressive osteomas and one case of bilateral compressive exostoses of the IAC. Osteomas and exostoses are benign tumors of the bone that occur in the head and neck region but are rarely found within the internal auditory canal (IAC). ![]()
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