Kenji Niwa - Articles - Scientific Research Publishing

An Extremely Rare Torsion Case of Ovarian Yolk Sac Tumor in Postmenopausal Woman (Articles)

Kenji Niwa, Saki Tsurue, Yuzo Niwa, Yoh Hayasaki, Sakae Mori, Kentaro Niwa, Takuji Tanaka

Open Journal of Pathology Vol.16 No.3, April 29, 2026

DOI: 10.4236/ojpathology.2026.163016 46 Downloads 312 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 879 Downloads 3,453 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 522 Downloads 1,660 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 83 Downloads 553 Views Citations
Recurrent Unperceived Pregnancies and Unbooked Deliveries Presenting in Labor to the Emergency Department: A Case Report (Articles)

Kenji Niwa, Saki Tsurue, Chiaki Kameyama, Kentaro Niwa, Atsuko Naoi, Tomohiro Morishita, Takuji Tanaka

Case Reports in Clinical Medicine Vol.15 No.8, August 19, 2026

DOI: 10.4236/crcm.2026.158046 25 Downloads 178 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 742 Downloads 2,823 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 806 Downloads 2,536 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 270 Downloads 1,149 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 119 Downloads 3,369 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 109 Downloads 746 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 359 Downloads 2,175 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 4,755 Downloads 6,832 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 3,073 Downloads 4,353 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 4,535 Downloads 6,708 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 1,705 Downloads 3,169 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 1,373 Downloads 3,291 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 1,404 Downloads 3,305 Views Citations
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 778 Downloads 2,225 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 1,507 Downloads 3,289 Views Citations
Uncertainty in a Measurement of Density Dependence on Population Fluctuations (Articles)

Hiro-Sato Niwa

Applied Mathematics Vol.5 No.8, April 29, 2014

DOI: 10.4236/am.2014.58104 4,963 Downloads 6,894 Views Citations

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