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Featured researches published by Chihiro Tanaka.
Surgery Today | 2001
Takashi Shiroko; Naoki Yokoo; Kiyohisa Okamoto; Yasuhito Kitakado; Hisaya Azuma; Takami Fukui; Chihiro Tanaka
Abstract We report herein the case of a 77-year-old woman found to have mixed medullary-papillary carcinoma in the right thyroid with lymph node metastases 30 years after a left thyroidectomy. The preoperative values of serum calcitonin and carcinoembryonic antigen (CEA) were high, and fine-needle aspiration biopsy revealed class V, which led us to suspect papillary carcinoma. A right thyroidectomy with dissection of the right neck lymph nodes was performed. Histopathological examination of the tumor specimens revealed gradual borders between medullary carcinoma and papillary carcinoma with positive immunohistochemical staining to calcitonin, chromogranin A, CEA, and thyroglobulin. The serum levels of calcitonin and CEA decreased to normal after the operation. The point mutation of the RET proto-oncogene was found to be negative by a DNA analysis of the peripheral leukocytes. This cancer seemed not to be associated with multiple endocrine neoplasia type 2 syndrome. The presence of both medullary and papillary components in the thyroid with lymph node metastases is rare and may suggest that the tumor had arisen from a common stem cell.
Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 1999
Takami Fukui; Naoki Yokoo; Takahiro Yoshida; Chihiro Tanaka; Tatsushi Kato; Hisaya Azuma; Takashi Shiroko; Tetsuya Yamaguchi; Kiyonao Okamoto
下血にて発症する小腸潰瘍はまれな疾患である. 筆者らは, 緊急開腹術にて単純性小腸潰瘍からの出血であることを究明しえた4例を経験したので報告する. 症例は44歳の女性, 65歳の男性, 54歳の男性, 67歳の女性. いずれも主訴は下血. 術前検索で, 胃・十二指腸・結腸・直腸よりの出血は否定. 全例緊急開腹術施行下, 術中内視鏡にて小腸潰瘍よりの出血を確認後, 病巣を含めて腸切除術を施行. 組織学的には, いずれもU1-II~IIIの良性潰瘍で, 単純性小腸潰瘍と診断された. 小腸潰瘍の術前確定診断を得ることは非常に困難である. したがって, 高度な貧血をきたす下血を認めながら, 消化管検査にて原因を究明しえない症例においては, 小腸潰瘍からの出血の可能性も念頭におき, 診断と治療を兼ねた開腹術下小腸内視鏡の施行を考慮すべきであると考えられる.
Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2003
Yoshihiro Tanaka; Naoki Yokoo; Yasuhito Kitakado; Takashi Shiroko; Chihiro Tanaka; Katsuaki Ura; Shinya Hamasu; Hiromitsu Nagata; Kiyohisa Okamoto
Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 1998
Chihiro Tanaka; Koujiro Matsumura; Tomio Kashizuka; Jun Sano; Nozomi Amaoka
Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2001
Chihiro Tanaka; Naoki Yokoo; Yasuhito Kitakado; Takashi Shiroko; Takami Fukui; Takahiro Yoshida; Katsuaki Ura; Shinya Hamasu; Kiyohisa Okamoto
Nihon Kyukyu Igakukai Zasshi | 2003
Takashi Shiroko; Chihiro Tanaka; Naoki Yokoo
Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2002
Chihiro Tanaka; Naoki Yokoo; Yasuhito Kitakado; Takashi Shiroko; Katsuaki Ura; Yoshihiro Tanaka
Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2002
Chihiro Tanaka; Naoki Yokoo; Yasuhito Kitakado; Takashi Shiroko; Takami Fukui; Takahiro Yoshida; Katsuaki Ura; Shinya Hamasu; Hiromitsu Nagata; Kiyohisa Okamoto
Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2000
Chihiro Tanaka; Naoki Yokoo; Tatsushi Kato; Takami Fukui; Hisaya Azuma; Tetsuya Yamaguchi
Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 2000
Chihiro Tanaka; Naoki Yokoo; Katsuaki Ura; Kouichirou Hata; Tatsushi Kato; Takami Fukui; Hisaya Azuma; Takashi Shiroko; Tetsuya Yamaguchi; Kiyohisa Okamoto