A Osteoma of the External Auditory Canal

A Case of Giant Osteoma Located across the Parietal and Temporal Bones

“…The present case was histologically categorized as the compact type. [2][3][4] Our literature review revealed that osteoma limited to the temporal bone is often surgically treated for esthetic reasons. 2,[10][11][12][13][14][15] The osteoma in the present case was large in size (a giant osteoma with maximum diameter exceeding 3 cm), 16,17) and was located across the superior temporal bone and inferior parietal bone.…”

“…Osteoma is often treated through surgical resection, and post-operative recurrence is very rare. 2,4,10,12,13,18,19) When osteoma is located on the temporal squama or mastoid process, a complete resection should be per-formed until normal mastoid air cells are exposed or the base of the osteoma should be removed until cortical bone without osteoma is confirmed. 10,12,13,15,20) In the present case, the exact location of the osteoma in the skull and the overall shape of the osteoma could be easily assessed on the 3D CT scan of the skull, and the 3D Temporal bone CT scan was used to assess the degree of invasion into the diploë of the skull, and the depth of skull resection was planned based on this assessment.…”

“…[1][2][3] Temporal osteoma may arise in any part of the temporal bone, but it is most commonly seen in the mastoid process after the external auditory meatus. [3][4][5][6][7] Moreover, in general, osteomas grow gradually; although temporal bone osteoma can be of various sizes, it does not exceed 3 cm upon initial presentation in most cases. 3,8,9) In the present case, a giant osteoma over 3 cm in diameter was found to involve the mastoid process, temporal squama, and parietal bone, in contrast to other commonly seen cases of osteoma limited to the temporal bone.…”