宮下 英高 (ミヤシタ ヒデタカ)

Miyashita, Hidetaka

写真a

所属(所属キャンパス)

医学部 歯科・口腔外科学教室 (信濃町)

職名

助教(有期)

 

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  • Clinical value of 3D SPECT/CT imaging for assessing jaw bone invasion in oral cancer patients

    Miyashita H., Nakahara T., Asoda S., Kameyama K., Kawaida M., Enomoto R., Shiba H., Jinzaki M., Kawana H., Nakagawa T.

    Journal of Cranio-Maxillofacial Surgery (Journal of Cranio-Maxillofacial Surgery)  47 ( 7 ) 1139 - 1146 2019年07月

    ISSN  10105182

     概要を見る

    © 2019 European Association for Cranio-Maxillo-Facial Surgery Purpose: This study compared the diagnostic accuracy of jaw bone invasion (JBI) of oral cancer observed with three-dimensional (3D) SPECT/CT, CT, and MRI, and evaluated the clinical advantages of 3D SPECT/CT compared to conventional two-dimensional (2D) SPECT/CT. Materials and methods: From April 2014 to January 2018, consecutive 16 oral cancer patients with suspected JBI, who had preoperatively undergone the imaging tests, were retrospectively enrolled. The likelihood of JBI was independently scored by a radiologist and oral surgeon. Using 2D or 3D SPECT/CT images, 20 oral surgeons delineated virtual surgical areas on 3D-printed jaws for 3 cases in which the extent of JBI was fully pathologically confirmed. The surgeons completed questionnaires regarding surgical planning and explanations for patients using Likert scales. Results: JBI was found in 9 patients including 5 (56%) with initial bone invasion. 3D SPECT/CT showed very high negative predictive value (100%) and inter-observer agreement (kappa = 0.917). 3D SPECT/CT was more sensitive than CT and MRI when inconclusive findings for JBI were considered negative. Compared to 2D SPECT/CT, 3D SPECT/CT had greater clinical advantages such as surgical planning and explanation to patients (p < 0.005). Conclusion: 3D SPECT/CT is useful not only for detecting JBI but also for surgical planning.

  • Acute odontogenic infection combined with crowned dens syndrome: A case report

    Soma T., Asoda S., Kimura M., Munakata K., Miyashita H., Nakagawa T., Kawana H.

    Journal of Medical Case Reports (Journal of Medical Case Reports)  13 ( 1 )  2019年05月

     概要を見る

    © 2019 The Author(s). Background: Calcium pyrophosphate dihydrate crystal deposition disease is a condition in which calcium pyrophosphate dihydrate crystal is deposited in joint cartilage and ligaments. Calcium pyrophosphate dihydrate crystal deposition disease that involves calcification around the odontoid process of the second cervical vertebra is called crowned dens syndrome. Crowned dens syndrome is accompanied by fever in addition to acute and intense neck, posterior head, and temporal pain; thus, distinguishing crowned dens syndrome may be difficult in the presence of odontogenic infection. To the best of our knowledge, this is the first report describing a patient with crowned dens syndrome with coexisting odontogenic infection. Case presentation: A 75-year-old Japanese woman was examined in the Emergency Department of this hospital due to a chief complaint of worsened buccal swelling on the left side. An odontogenic infection was considered, and she underwent her first examination. She presented with a body temperature of 37.4 °C, marked swelling and tenderness of her left lower eyelid through to her left cheek, and pain on the left temporal area. Blood tests revealed a leukocyte count of 6700/μL and a C-reactive protein level of 7.15 mg/dL. There was swelling and pain around the gingiva and acute purulent apical periodontitis of left maxillary second premolar. Cellulitis of the left cheek was diagnosed. After performing drainage of the pus, antibiotic treatment was initiated. Although her clinical symptoms improved, blood tests on day 9 of hospitalization revealed a leukocyte count of 6500/μL and a C-reactive protein level of 25.62 mg/dL, which were indicative of worsening symptoms. Computed tomography was performed to evaluate remote infection and images revealed a calcification around the odontoid process of her second cervical vertebra. When she was referred to the Orthopedic Surgery Department, pseudogout of the cervical spine was diagnosed. Subsequently, oral acetaminophen was initiated, and both her leukocyte count and C-reactive protein improved markedly. Conclusions: In the presence of persistent fever and abnormally high leukocyte and C-reactive protein indicative of an inflammatory reaction, coexistence of pseudogout should be considered. In particular, when symptoms of temporal pain are present, the possibility of pseudogout of the cervical spine must be considered in the differential diagnosis.

  • A case of spindle cell/pleomorphic lipoma on inferior border of the mandible

    Munakata K., Asoda S., Usuda S., Miyashita H., Soma T., Hasegawa T., Ogawa C., Ohyama S., Yamauchi T., Kawaida M., Kameyama K., Nakagawa T., Kawana H.

    Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology (Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology)  2019年

    ISSN  22125558

     概要を見る

    © 2019 Asian AOMS(+) ASOMP(+) JSOP(+) JSOMS(+) JSOM(+) and JAMI Spindle cell lipomas and pleomorphic lipomas are uncommon and distinct variants of benign lipomas. Although spindle cell lipomas and pleomorphic lipomas were originally considered different entities, the recent WHO classification defines them as spindle cell/pleomorphic lipoma (SCL/PL). This is because of their similar clinical features and the existence of intermediate histopathological features between them. A 77-year-old male presented to our clinic with a painless swelling on the left inferior border of the mandible. Computed tomography revealed a clearly defined mass in the subcutaneous lesion. With a histopathological diagnosis of myxolipoma, demonstrated by biopsy, excisional surgery was performed under general anesthesia. The histopathology revealed SCL/PL with the presence of spindle cells and mature adipocytes. No tumor recurrence had been noted at two year after surgery.

  • A case of platelet transfusion refractoriness occurring after platelet transfusion for tooth extraction in myelodysplastic syndromes patient

    Soma T., Asoda S., Iwasaki R., Miyashita H., Inoue M., Yamada Y., Uchiyama K., Nakagawa T., Kawana H.

    Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology (Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology)  30 ( 6 ) 496 - 499 2018年11月

    ISSN  22125558

     概要を見る

    © 2018 Asian AOMS(+) ASOMP(+) JSOP(+) JSOMS(+) JSOM(+) and JAMI Myelodysplastic syndrome is an acquired hematopoietic disorder showing symptoms of pre-leukemia and refractory anemia. In the tooth extraction process of such cases, bleeding tendency due to pancytopenia, infection etc., becomes a problem. As such, a cautious approach is required. We have confirmed platelet transfusion refractoriness prior to tooth extraction in a myelodysplastic syndrome patient, and hereby report a case of tooth extraction following human leukocyte antigen (HLA)-compatible concentrated platelet transfusion. The patient was a 55-year-old female who was examined at our department due to a request for the extraction of tooth No. 36. Following consultation at the Hematology Department, platelet transfusion was performed as a pretreatment upon hospitalization. Increased body temperature, chills, shivers, and feelings of discomfort in the pharynx were observed. A close examination was performed due to a lack of increase in platelet count, and revealed platelet transfusion refractoriness caused by anti-HLA antibodies. Therefore, the patient was re-hospitalized and transfused with a platelet concentrate-HLA preparation. One hour later, an increase in platelet count was confirmed and the tooth extraction was performed. There was no evidence of bleeding or infection following extraction, and the prognosis was good.

  • Dedifferentiated parosteal osteosarcoma of the maxilla: A case report and review of the literature

    Miyashita H., Yoshida K., Soma T., Kameyama K., Sasaki A., Hisaoka M., Yazawa M., Morioka H., Takahashi M., Nakagawa T., Kawana H.

    Journal of Medical Case Reports (Journal of Medical Case Reports)  12 ( 1 )  2018年08月

     概要を見る

    © 2018 The Author(s). Background: Parosteal osteosarcomas are usually low-grade tumors, however, sometimes they transform to high-grade tumors, which is named dedifferentiation. This phenomenon has been reported in long bones. Recently, we encountered a patient with dedifferentiated parosteal osteosarcoma occurring in the maxilla. Here, we report a first case of dedifferentiated parosteal osteosarcoma of the head and neck region. Case presentation: A 45-year-old Japanese woman with a refractory bone lesion in the maxilla presented to our hospital. A biopsy showed atypical spindle cell proliferation involving dedifferentiated high-grade component, which was diagnosed as dedifferentiated parosteal osteosarcoma. Three cycles of neoadjuvant chemotherapy using ifosfamide and pirarubicin were performed followed by sub-total maxillectomy. Histopathological results showed that neoadjuvant chemotherapy was effective for high-grade component. The decision to perform adjuvant chemotherapy (cisplatin and pirarubicin) was made because distant metastasis has been reported, even in cases with dedifferentiated parosteal osteosarcoma in which complete necrosis of high-grade component was achieved due to neoadjuvant chemotherapy. There was no recurrence 15 months after surgery. Conclusions: Dedifferentiated parosteal osteosarcoma can occur in the head and neck region. Chemotherapy including anthracycline anticancer agent could be effective for high-grade component of dedifferentiated parosteal osteosarcoma.

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