KEIO RESEARCHERS INFORMATION SYSTEM

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Life Science / Radiological sciences (放射線診断学)

Books 【 Display / hide 】

Books 【 Display / hide 】

• 救急画像診断 一問一答

  八木 文子, 山田 祥岳, 陣崎 雅弘, Ｇａｋｋｅｎ, 2026.04

  Scope: p110-112

• 泌尿器領域画像診断の勘ドコロNEO

  秋田 大宇, 八木 文子, メジカルビュー社, 2021.04,  Page： xv, 295p

  Scope: p4-11

  • CiNii Research

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• WHO 2022 Renal Cell Tumor Classification: Imaging Features and Clinical Implications.

  Jinzaki M, Nicola R, Withey SJ, Fütterer JJ, Akita H, Yamamoto A, Ikeda O, Yagi F, Tsuzuki T, Moch H

  Radiographics : a review publication of the Radiological Society of North America, Inc 46 ( 7 ) e250098 2026.07

  ISSN  0271-5333

  • Access to Document (DOI)

• Hyperattenuation on non-enhanced CT and T2 hypointensity: an imaging pattern frequently associated with fibrous or smooth muscle-rich abdominal and pelvic lesions.

  Ikeda O, Jinzaki M, Akita H, Yamada Y, Wei C, Yagi F, Tsuzaki J, Tsujioka Y

  Abdominal radiology (New York)  2026.06

  • Access to Document (DOI)

• A Case of Testicular Malakoplakia With Markedly High Signal Intensity on Fat‐Suppressed T1‐Weighted Images

  Fumiko Yagi, Hirotaka Akita, Takeo Kosaka, Akihisa Ueno, Teppei Kotera, Masato Kobayashi, Hideaki Mekada, Mototsugu Oya, Masahiro Jinzaki

  IJU Case Reports 9   e70187 2026.05

  Lead author, Corresponding author, Accepted

  • Access to Document (DOI)

• Application of upright multidetector CT in orthopedics and the musculoskeletal system: insights into anatomy, alignment, and biomechanics.

  Yoshitake Yamada, Minoru Yamada, Yoichi Yokoyama, Kazuya Kaneda, Yuki Yoshida, Ryo Sasaki, Hiroyuki Seki, Ryo Mizukoshi, Fumiko Yagi, Noboru Matsumura, Taiki Nozaki, Takeo Nagura, Masaya Nakamura, Masahiro Jinzaki

  Japanese journal of radiology  2026.04

  Accepted,  ISSN  1867-1071

  • Access to Document (DOI)

• 【押さえておくべき注目の疾患と知見2026】(7章)泌尿器　形質細胞様亜型尿路上皮癌

  八木 文子, 秋田 大宇, 陣崎 雅弘

  画像診断 ((株)Gakken)  46 ( 4 ) S124 - S126 2026.03

  ISSN  0285-0524

  　View Summary

  ＜文献概要＞PUCは,浸潤性尿路上皮癌の稀なサブタイプで,病理組織学的には,形質細胞腫,悪性リンパ腫,印環細胞癌,転移性乳癌や胃癌と類似している.

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Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• 悪性リンパ腫との鑑別に苦慮した高齢発症の精巣セミノーマの1例

  宮崎 彩花, 八木 文子, 秋田 大宇, 陣崎 雅弘, 松本 一宏, 大家 基嗣, 大喜多 肇, 上野 彰久

  Japanese Journal of Radiology ((公社)日本医学放射線学会)  44 ( Suppl. ) 28 - 28 2026.02

  ISSN  1867-1071

• 続General Radiology診断演習　大切なものは目にみえない

  八木 文子, 秋田 大宇, 陣崎 雅弘

  画像診断 ((株)Gakken)  45 ( 13 ) 1302 - 1305 2025.10

  ISSN  0285-0524

  　View Summary

  ＜文献概要＞40歳代,女性.LDH高値,骨盤内腫瘤

• 【続General Radiology診断演習】大切なものは目にみえない

  八木 文子, 秋田 大宇, 陣崎 雅弘

  画像診断 45 ( 13 ) 1302 - 1305 2025.10

• Correction to: A case of immunoglobulin G4-related disease with a urethral lesion diagnosed by radiological imaging before biopsy (Abdominal Radiology, (2024), 50, 4, (1672-1678), 10.1007/s00261-024-04594-0)

  Yagi F., Akita H., Matsumoto K., Arai E., Meng W., Furuya K., Senda S., Oya M., Jinzaki M.

  Abdominal Radiology 50 ( 10 ) 5066 - 5067 2025.10

  ISSN  2366004X

  　View Summary

  The original version of this article unfortunately contained a mistake. The “Abstract” and “Keywords” sections were missing in the published version. However, now it is corrected. We present a 50-year-old female with IgG4-related disease (IgG4-RD) of the urethra. She had been diagnosed with IgG4-RD involving the pancreas, lacrimal glands, salivary glands, kidneys, and right breast 5 years earlier, which had remitted after steroid treatment. In recent months, she had experienced urinary incontinence. Her local physician noted a urethral stricture. Magnetic resonance imaging (MRI) showed a lesion surrounding the urethra, with a slightly high signal intensity on T2-weighted and short-term inversion recovery images, and a mildly high signal intensity on diffusion-weighted images. Accordingly, IgG4-RD involving the urethra was suggested. Her serum IgG4 level was slightly elevated at 127 mg/dL, which is below the normal upper limit of 135 mg/dL. A transurethral biopsy revealed significant lymphocytic and IgG4-positive plasma cell infiltrates (50–80/high-power field), fibrosis, and obstructive phlebitis. Thus, IgG4-RD of the urethra was confirmed. A systematic search including CT and MRI did not reveal any new gross lesions. Steroid therapy improved her symptoms within a few days. Follow-up MRI revealed shrinking of the urethral lesion and lower signal intensity on T2-weighted images. IgG4-RD with urethral lesions is extremely rare. No cases of diagnosis of IgG4-RD urethral lesions based on MRI findings before biopsy have been reported to date. When a middle-aged woman presents with uniform circumferential urethral lesions, IgG4-RD should be considered in the differential diagnosis. Here, we report detailed imaging findings and radiological differential diagnoses, and discuss relevant literature. Keywords Urinary incontinence, Circumferential lesion, Dysuria, IgG4-related disease, Periurethral lesion, Urethra The original article has been corrected.

  • Access to Document (DOI)

• 【IgG4関連疾患とその鑑別 -IgG4-related or not? That is the question-】腎泌尿器領域のIgG4関連疾患とその鑑別

  八木 文子, 秋田 大宇, 陣崎 雅弘

  画像診断 ((株)Gakken)  45 ( 12 ) 1157 - 1167 2025.09

  ISSN  0285-0524

  　View Summary

  ＜文献概要＞●腎皮質・辺縁優位に両側性の小さな結節が多発性に認められた場合,IgG4関連疾患(IgG4-RD)の尿細管間質性腎炎の可能性がある.その画像所見は多彩であり,単発性腫瘤の形態を呈した場合には,乏血性腎細胞癌との鑑別が困難である.●IgG4-RDの上部尿路病変では,尿路上皮癌と比較し,両側性,尿路病変が長い,壁外への進展,境界不明瞭,漸増性の造影効果,大動脈浸潤,大動脈周囲/仙骨前/骨盤壁領域の脂肪織濃度上昇などの尿路外所見を呈する.●中高年女性で均一な全周性の尿道病変をみた際には,鑑別にIgG4-RDを考慮する.●IgG4-RDの既往がある,あるいは疑われる症例において,下部尿路症状や逆V字型FDG集積を来した場合には,IgG4-RDによる前立腺病変の可能性も考慮する.●IgG4-RDの陰嚢内病変は,精巣上体炎や線維性偽腫瘍として発症する場合がある.

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Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• 腎泌尿器領域のIgG4関連疾患とその鑑別疾患

  八木文子

  第18回西日本GUR研究会, 

  2026.05

• 症例検討

  八木文子, 千代田 達幸, 上野 彰久, 山田 祥岳, 陣崎 雅弘

  信濃町画像診断セミナー, 

  2026.05

• 副卵巣の一例

  八木文子, 中村加奈子, 陣崎雅弘

  第93回東京泌尿生殖器放射線勉強会, 

  2026.05

• IgG4-related disease in the urinary tract; imaging findings and mimickers

  Fumiko Yagi, Hirotaka Akita, Yoshitake Yamada, Masahiro Jinzaki

  第85回日本医学放射線学会総会, 

  2026.04

• Upright CT Imaging for the Musculoskeletal System

  Yoshitake Yamada, Minoru Yamada, Yoichi Yokoyama, Taiki Nozaki, Orito Ikeda, Fumiko Yagi, Yuki Iwaita, Takeo Nagura, Masaya Nakamura, Masahiro Jinzaki

  第85回日本医学放射線学会総会, 

  2026.04

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Awards 【 Display / hide 】

Awards 【 Display / hide 】

• 成績優秀者 第1位

  2026.05, 第18回西日本GUR研究会

• 第31回「画像診断」MVP 賞

  八木 文子, 2026.03, 「画像診断」編集委員会, 腎泌尿器領域のIgG4関連疾患とその鑑別

• レントゲンカンファレンス優秀解答者

  八木文子, 2026.02, 第45回日本画像医学会学術集会

• Certificate of Merit

  Fumiko Yagi, Hirotaka Akita, Yoshitake Yamada, Masahiro Jinzaki, 2025.12, Radiological Society of North America (RSNA) 2025, IgG4-related disease in the urinary tract; imaging findings and mimickers

• Identified for RadioGraphics

  Fumiko Yagi, Hirotaka Akita, Yoshitake Yamada, Masahiro Jinzaki, 2025.12, Radiological Society of North America (RSNA) 2025, IgG4-related disease in the urinary tract; imaging findings and mimickers

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Academic Activities 【 Display / hide 】

Academic Activities 【 Display / hide 】

• Radiology Case Reports

  2026.05

  -

  Present

• Case Reports in Radiology

  2026.04

  -

  Present

• Quantitative Imaging in Medicine and Surgery

  2026.02

  -

  Present

• Case reports in obstetrics and gynecology

  2026.01

  -

  Present

• Magnetic Resonance in Medical Sciences

  2026.01

  -

  Present

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