Pathologic (non-otosclerotic) bone formation in otosclerotic and non-otoselerotic temporal bones

Pathology of Chronic Suppurative Otitis Media

“…For this purpose, we would like to point out that the 'mosaic-like pattern" is not only found in Paget's disease, but there is also evidence of it any times there is a rather quick alternation of bone resorption and bone reconstruction [Ascenzi, personal commun., 1972], The 'mosaic-like pat tern" cannot be considered as pathognomonic of Paget's disease, although this is a fundamental feature of this illness. There are actually other bone diseases, such as fibrous displasia, otospongiosis, chronic osteomyelitis, etc., in which different authors [O lgivie, 1962;J affe, 1968;Kelemen, 1970Kelemen, , 1971 have found Paget-like aspects.…”

Internal Auditory Canal Osteoma: Case Report and Review of the Literature

“…Exostoses may exist in the IAC, but these lesions have a broader base when compared to osteomas. 20 The diagnosis of an osteoma relies mainly on a thinslice CT scan, which exhibits a well-demarcated, dense, bony outgrowth of the IAC, precluding almost any other lesion. Another useful imaging technique is MRI, which demonstrates a bright signal intensity on T1-weighted sequences (if marrow is present in the osteoma) and a hypointense signal intensity on T2-weighted sequences.…”

Osteoma of the Internal Auditory Canal

“…This feature alone does not exclude other disorders, as discrete bony lesions within the IAC occur in otosclerosis and Paget disease. 5,6 Likewise, some cases of IAC exostoses are well documented. 5 All these lesions tend to be more broad based than the osteoma.…”

“…5,6 Likewise, some cases of IAC exostoses are well documented. 5 All these lesions tend to be more broad based than the osteoma. Thus, the radiographic appearance of the lesion is of considerable value in suggesting the ultimate diagnosis.…”

“…A narrow IAC may be seen as a congenital anomaly in conjunction with eighth-nerve aplasia or in disorders of bone, including osteopetrosis, Paget disease, otosclerosis, or fibrous dysplasia. [2][3][4][5] The narrowing develops either from new bone growth within the IAC or from generalized enlargement of the medial temporal bone, which producesconcentricstenosis.Broad-basedbony lesions of the superior or medial surface of the temporal bone, which can secondarily compromise the lumen of the IAC, are also described. [6][7][8] In these instances, focal narrowing occurs at the porus acousticus.…”