Section of Laboratory Medicine and Obstetrics & Gynecology, Gujo City Hospital, Gujo, 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 660 Downloads 1,742 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 724 Downloads 2,850 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 32 Downloads 175 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 391 Downloads 1,259 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 672 Downloads 1,964 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 239 Downloads 1,509 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 4,385 Downloads 5,752 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 1,333 Downloads 2,744 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 1,263 Downloads 2,637 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 4,566 Downloads 6,230 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 563 Downloads 1,949 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 2,945 Downloads 3,884 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 1,568 Downloads 2,708 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 170 Downloads 728 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 1,236 Downloads 2,642 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 36 Downloads 199 Views Citations
Hidden renal disease in a female patient with long-lasting isolated gestational proteinuria followed by hypertension (Articles)

Kosuke Kawabata, Rina Akaishi, Ayako Nozaki, Osamu Sato, Kaoru Hanatani, Hisanori Minakami

Open Journal of Obstetrics and Gynecology Vol.3 No.9，November 27, 2013

DOI: 10.4236/ojog.2013.39124 4,176 Downloads 5,806 Views Citations
An Attempt to Classify Gram-Stained Vaginal Smears with a Nugent Score of 4 into Four Bacterial Morphotypes at First Prenatal Visit (Articles)

Satoshi Shimano, Atsushi Yasuda, Takashi Ogaya, Sachiko Miura, Hideaki Negishi, Masahiro Mizunuma, Tsuyoshi Saito

Advances in Microbiology Vol.10 No.3，March 5, 2020

DOI: 10.4236/aim.2020.103006 1,133 Downloads 8,183 Views Citations
Postrecurrence Clinical Outcome of Patients with Stage I Epithelial Ovarian Cancer Who Underwent Fertility-Sparing Surgery Compared to Those with Radical Surgery (Articles)

Hiroaki Kajiyama, Kiyosumi Shibata, Mika Mizuno, Eiko Yamamoto, Michiyasu Kawai, Tetsuro Nagasaka, Fumitaka Kikkawa

Surgical Science Vol.4 No.1，January 29, 2013

DOI: 10.4236/ss.2013.41022 4,315 Downloads 6,160 Views Citations
Immunohistochemical Analysis of p16 Expression in Uterine Smooth Muscle Tumors (Articles)

Seiji Kanayama, Hidekazu Oi, Ryuji Kawaguchi, Naoto Furukawa, Hiroshi Kobayashi

Open Journal of Obstetrics and Gynecology Vol.5 No.12，October 7, 2015

DOI: 10.4236/ojog.2015.512097 3,597 Downloads 4,909 Views Citations

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