A Clinical Study of the Length of the Styloid Process on CT Images in 242 Cases and a Case of Elongated Styloid Process Removed by External Cervical Incision

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  • Toge Sakiko
    Department of Otolaryngology-Head and Neck Surgery, Imakiire General Hospital Department of Otolaryngology-Head and Neck Surgery,Graduate School of Medical and Dental Sciences, Kagoshima University
  • Hanamure Yutaka
    Department of Otolaryngology-Head and Neck Surgery, Imakiire General Hospital
  • Sekiyama Kohsuke
    Department of Otolaryngology-Head and Neck Surgery, Imakiire General Hospital
  • Yamashita Masaru
    Department of Otolaryngology-Head and Neck Surgery,Graduate School of Medical and Dental Sciences, Kagoshima University

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Other Title
  • 頸部 CT 画像242例による茎状突起の長さに関する解剖学的計測および茎状突起過長症症例の検討
  • ケイブ CT ガゾウ 242レイ ニ ヨル ケイジョウ トッキ ノ ナガサ ニ カンスル カイボウガクテキ ケイソク オヨビ ケイジョウ トッキ カチョウショウ ショウレイ ノ ケントウ

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Abstract

<p>　 Using cervical CT and 3D-CT imaging, we measured the lengths of the styloid processes of 242 patients in 484 views. The mean length of the styloid processes was 23.6 mm, and styloid processes with lengths ≥ 30 mm formed 11% and 15.3% of all views and cases, respectively. No difference in length was observed between the left and right views of the styloid processes. With respect to age, patients with ages ≥ 20 years had significantly longer styloid processes than those with ages <20 years. For patients with ages ≥ 20 years, no significant differences were observed among the various age groups. The styloid processes seemed to cease elongation after the growth period. In 37 cases (18[48.6%] bilateral cases and 19 [51.4%] unilateral cases), the lengths of the styloid processes were ≥ 30 mm, and this observation was significantly more frequent among males. The overgrowth of the styloid process was observed in 19.4% of males, 10.6% of females, and 15.3% of all cases. In this cohort, one case of elongated styloid process underwent resection by an external cervical incision. 3D-CT imaging and CT angiography were useful in the preoperative evaluation and surgical manipulation of the patient. Elongated styloid processes are associated with a wide variety of symptoms and have been reported to lead to serious outcomes in certain cases. When an incidental finding of an overgrowth of the styloid process is made on imaging, detailed history of the patient's symptoms and collaboration with other departments are necessary in managing such cases of elongated styloid process.</p>

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