Section of Laboratory Medicine, Gujo City Hospital, Gujo City, Gifu, Japan - Articles

Primary Urethral Malignant Melanoma in an Elder Woman Diagnosed by Urine Cytology (Case Report)

Kenji Niwa, Tsuneo Ishihara, Sakae Mori, Keigo Kuwabara, Saki Murase, Motoki Takenaka, Yoshio Yamaguchi, Takuji Tanaka

Open Journal of Pathology Vol.10 No.1, December 31, 2019

DOI: 10.4236/ojpathology.2020.101002 723 Downloads 2,006 Views Citations
Case Report: A Laparoscopic Treated Case of Deep Infiltrating Endometriosis with Vaginal Invasion Diagnosed by Vaginal Cytology (Articles)

Kenji Niwa, Ryuichiro Yano, Yui Hatanaka, Sakae Mori, Yoshio Yamaguchi, Minako Mori, Yoko Ueda, Takuji Tanaka

Open Journal of Pathology Vol.5 No.3, July 9, 2015

DOI: 10.4236/ojpathology.2015.53012 4,472 Downloads 6,417 Views Citations
Primary Small Cell Neuroendocrine Carcinoma of the Endometrium: A Cytologically Diagnosed Case with Immunocytochemical, Immunohistochemical, and Electron Microscopic Features (Articles)

Kentaro Nagata, Kenji Niwa, Sakae Mori, Keigo Kuwabara, Motoki Takenaka, Yoshio Yamaguchi, Kentaro Niwa, Takuji Tanaka

Open Journal of Pathology Vol.10 No.4, September 14, 2020

DOI: 10.4236/ojpathology.2020.104011 800 Downloads 3,179 Views Citations
Follow-Up of HPV Clearance after LEEP Conization and Vaporization for CIN2⁺, and Vaporization for VaIN2 (Articles)

Kenji Niwa, Saki Tsurue, Rui Kyogoku, Masanori Isobe, Yoh Hayasaki, Sakae Mori, Keigo Kuwabara, Kentaro Niwa, Takuji Tanaka

Open Journal of Pathology Vol.15 No.3, July 8, 2025

DOI: 10.4236/ojpathology.2025.153013 66 Downloads 2,188 Views Citations
Primary Ovarian Carcinosarcoma: Cytological, Pathological, Immunocytochemical, and Immunohistochemical Features (Articles)

Kenji Niwa, Sakae Mori, Keigo Kuwabara, Kentaro Nagata, Motoki Takenaka, Tomomi Shiga, Yoshio Yamaguchi, Kentaro Niwa, Takuji Tanaka

Open Journal of Pathology Vol.11 No.1, January 21, 2021

DOI: 10.4236/ojpathology.2021.111003 750 Downloads 2,254 Views Citations
A Case of Serous Tubal Intraepithelial Carcinoma Diagnosed by Cytology during the Operation (Case Report)

Kenji Niwa, Tsuneo Ishihara, Yoko Ueda, Motoki Takenaka, Tomomi Shiga, Sakae Mori, Keigo Kuwabara, Yoshio Yamaguchi, Takuji Tanaka

Open Journal of Pathology Vol.8 No.3, June 27, 2018

DOI: 10.4236/ojpathology.2018.83008 1,432 Downloads 3,047 Views Citations
A Case of Struma Ovarii Diagnosed by Cytology during Laparoscopic Surgery (Case Report)

Kenji Niwa, Motoki Takenaka, Tsuneo Ishihara, Sakae Mori, Keigo Kuwabara, Saki Murase, Yoshio Yamaguchi, Takuji Tanaka

Open Journal of Pathology Vol.9 No.1, December 17, 2018

DOI: 10.4236/ojpathology.2019.91001 1,332 Downloads 2,981 Views Citations
Asymptomatic Anisakiasis of the Colon Diagnosed and Treated by Colonoscopy (Articles)

Tomoshi Takeda, Kenji Niwa, Akie Sano, Atsunori Kodama, Kuninori Hatasa, Yasunari Matsuno, Masao Kagami, Motoki Takenaka, Kohjiro Niwa, Takuji Tanaka

Case Reports in Clinical Medicine Vol.9 No.9, September 21, 2020

DOI: 10.4236/crcm.2020.99041 657 Downloads 2,485 Views Citations
Congenital Dysfibrinogenemia Presented with Massive Hematomas Formed after Hysterectomy (Articles)

Kenji Niwa, Kentaro Nagata, Takefumi Nakagami, Ryuichiro Shimaoka, Kentaro Niwa, Motoki Takenaka, Takuji Tanaka, Nobuo Okumura

Case Reports in Clinical Medicine Vol.10 No.4, April 22, 2021

DOI: 10.4236/crcm.2021.104013 463 Downloads 1,478 Views Citations
Primary Serous Cystadenocarcinoma of Broad Ligament: A Case Report with Laparoscopic, Histopathologic and Immunohistochemical Findings (Articles)

Kenji Niwa, Motoki Takenaka, Takeaki Saitake, Tiger Koike, Kentaro Nagata, Kentaro Niwa, Kohjiro Niwa, Sakae Mori, Keigo Kuwabara, Akane Onogi, Takuji Tanaka

Open Journal of Pathology Vol.12 No.1, December 13, 2021

DOI: 10.4236/ojpathology.2022.121003 311 Downloads 1,933 Views Citations
Proliferative Brenner Tumor with Borderline Mucinous Cystadenocarcinoma of the Ovary in a 75-Year-Old Woman (Articles)

Kenji Niwa, Hiroshi Makino, Yoshio Yamaguchi, Sakae Mori, Nozomi Narikawa, Takuji Tanaka

Open Journal of Pathology Vol.4 No.2, April 22, 2014

DOI: 10.4236/ojpathology.2014.42008 4,669 Downloads 6,547 Views Citations
Conservative Medroxyprogesterone Acetate Therapy in Early Stage of Endometrial Carcinoma Associated with Phosphatase and Tensin Homolog Expression (Articles)

Kenji Niwa, Minako Mori, Tatsuhiko Miyazaki, Takuji Tanaka, Ken-Ichiro Morishige

Open Journal of Pathology Vol.7 No.1, December 8, 2016

DOI: 10.4236/ojpathology.2017.71001 1,642 Downloads 2,910 Views Citations
Umbilical Endometriosis without Pelvic Surgery (Articles)

Kenji Niwa, Yusuke Mizuno, Ryuichiro Yano, Yoko Ueda, Nozomi Narikawa, Takuji Tanaka

Open Journal of Pathology Vol.4 No.4, October 10, 2014

DOI: 10.4236/ojpathology.2014.44022 3,005 Downloads 4,088 Views Citations
Cytology and Genetic Analysis of Liver Echinococcosis in a Woman Came from Bolivia (Articles)

Naoki Futamra, Kenji Niwa, Masato Ohta, Sakae Mori, Ayumi Hara, Yuzo Niwa, Yoshifumi Katagiri, Takuji Tanaka, Kentaro Nakamoto

Case Reports in Clinical Medicine Vol.11 No.9, September 22, 2022

DOI: 10.4236/crcm.2022.119056 227 Downloads 946 Views Citations
Endometrial Hyperplasia with Conservative Treatment Using the Progestin or EP Agents, Compared to Cases that Worsen during Observation (Articles)

Kenji Niwa, Saki Tsurue, Kentaro Niwa, Yoh Hayasaki, Masanori Isobe, Takuji Tanaka

Open Journal of Pathology Vol.16 No.1, January 4, 2026

DOI: 10.4236/ojpathology.2026.161007 47 Downloads 295 Views Citations
Primary Fallopian Tube Adenocarcinoma Discovered with the Vaginal Cytology: A Case Report with Pathological and Immunohistochemical Investigation (Case Report)

Tomoko Honda, Yuka Hiraku, Ryogo Aoki, Kenji Niwa, Naoki Watanabe, Takuji Tanaka

Open Journal of Pathology Vol.8 No.3, July 13, 2018

DOI: 10.4236/ojpathology.2018.83010 1,308 Downloads 2,954 Views Citations
Extensive Subcutaneous Emphysema and Ventilatory Failure during Gynecologic Laparoscopic Surgery: A Case Report (Articles)

Kentaro Niwa, Kenji Niwa, Hirokazu Yamada, Yuzu Iwakaki, Yusuke Amaya, Sayaka Fujiwara, Hideaki Tsuyoshi, Makoto Orisaka, Yoshio Yoshida

Case Reports in Clinical Medicine Vol.14 No.7, July 16, 2025

DOI: 10.4236/crcm.2025.147044 70 Downloads 465 Views Citations
Clinical Utility of Tumor Markers (Articles)

Taro Mizuno, Takayuki Goto, Kota Shimojo, Naoki Watanabe, Takuji Tanaka

Open Journal of Pathology Vol.11 No.2, April 30, 2021

DOI: 10.4236/ojpathology.2021.112005 1,667 Downloads 10,624 Views Citations
Cryoablation-Induced Anti-Cancer Immune Reaction—Immune Reaction Induced By Cryoablation (Articles)

Shinji Osada, Hisashi Imai, Yoshiyuki Sasaki, Itaru Yasufuku, Ryuichi Asai, Yoshihisa Tokumaru, Takuji Sakuratani, Kazuhiro Yoshida

Journal of Cancer Therapy Vol.2 No.2, June 29, 2011

DOI: 10.4236/jct.2011.22015 5,717 Downloads 10,059 Views Citations
A Case Report of Multiple Cylindroma with Immunohistochemical Features (Articles)

Naoki Watanabe, Kana Kawase, Chisato Tawada, Kazufumi Yoneda, Kuniaki Hirai, Ayumi Niwa, Takuji Tanaka

Open Journal of Pathology Vol.6 No.3, June 29, 2016

DOI: 10.4236/ojpathology.2016.63016 2,611 Downloads 4,706 Views Citations

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