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Iohexol oral rinse to differentiate the palatoglossal surfaces in computed tomography of patients with obstructive sleep apnoea

  • R. Sasaki
    Affiliations
    Craniofacial Center, Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital and Chang Gung University, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan

    Craniofacial Research Center, Chang Gung Memorial Hospital, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan

    Department of Oral and Maxillofacial Surgery, Tokyo Women's Medical University School of Medicine, 8-1 Kawada-cho, Shinjyuku-ku, Tokyo, 167-8666, Japan
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  • Y-C. Cheung
    Affiliations
    Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan
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  • E-C. Chan
    Affiliations
    Craniofacial Center, Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital and Chang Gung University, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan

    Dr. Edmund Chan's Clinic, Unit 602-3, Manning House, 48 Queen's Road Central, Central, Hong Kong
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  • C-H. Lin
    Correspondence
    Corresponding author at:Dr. Cheng-Hui Lin, Craniofacial Center, Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan. Tel.: +886-3-3281200; fax: +886-3-3271029.
    Affiliations
    Craniofacial Center, Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital and Chang Gung University, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan

    Craniofacial Research Center, Chang Gung Memorial Hospital, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan
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  • Y-R. Chen
    Affiliations
    Craniofacial Center, Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital and Chang Gung University, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan

    Craniofacial Research Center, Chang Gung Memorial Hospital, 5 Fu-Shin Street, Kwei Shan, Taoyuan 333, Taiwan
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      Computed tomography (CT) of the head and neck has become essential for craniofacial evaluation, planning, and treatment of patients with dentofacial deformities. Its usefulness is not limited to 3-dimensional cephalometry and computer-aided simulation of operations, but is also crucial in the evaluation of the pharyngeal airway, particularly in those with retrognathia and obstructive sleep apnoea. Observing the oropharyngeal soft tissue structures, including the tongue, soft palate, and uvula, helps to better understand the narrowed airway.
      • Lin C.H.
      • Liao Y.F.
      • Chen N.H.
      • et al.
      Three-dimensional computed tomography in obstructive sleep apneics treated by maxillomandibular advancement.
      The similar density of the tongue and the soft tissues of the palate makes their differentiation difficult without proper contrast, (Fig. 1) so we devised a simple technique to improve it on CT.
      Figure thumbnail gr1
      Fig. 1Plane computed tomogram (without contrast) of a 22-year-old woman with obstructive sleep apnoea, (sagittal (A) and coronal (B) sections). The pharyngeal airway was narrowed, with the oral cavity crowded by the soft palate and tongue.

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