Summary
We present herein a rare case of osteoma mixtum of the mastoid. The main features of the osteoma were demonstrated clearly by preoperative tangential X-ray projection. Histological studies revealed the osteoma to be composed of multiple small foci of ossification on the outer layer with a large single inner mass. Subsequent examinations revealed that the osteoma had arisen from the parietosquamosal suture.
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Ishikawa, T., Saito, H. & Takahashi, K. Osteoma of the mastoid. Arch Otorhinolaryngol 217, 93–97 (1977). https://doi.org/10.1007/BF00453895
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DOI: https://doi.org/10.1007/BF00453895