Department of Obstetrics and 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 652 Downloads 1,700 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 704 Downloads 2,771 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 18 Downloads 80 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 662 Downloads 1,909 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 378 Downloads 1,219 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 236 Downloads 1,460 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 2,936 Downloads 3,856 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 4,377 Downloads 5,685 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 1,327 Downloads 2,705 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 1,256 Downloads 2,598 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 9 Downloads 64 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 1,225 Downloads 2,586 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 4,553 Downloads 6,186 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 553 Downloads 1,900 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 1,551 Downloads 2,671 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 162 Downloads 697 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 4,164 Downloads 5,773 Views Citations
Actual Use of Rigid Hysteroscope Intrauterine BIGATTI Shaver (IBS^®) with a Morcellator System (Articles)

Toshiyuki Kakinuma, Kaoru Kakinuma, Ayano Shimizu, Takahum Okusa, Eri Suizu, Masataka Kagimoto, Masaki Abe, Koyomi Saito, Michitaka Ohwada, Nobuhiro Takeshima, Kaoru Yanagida

Open Journal of Obstetrics and Gynecology Vol.11 No.11，November 17, 2021

DOI: 10.4236/ojog.2021.1111140 181 Downloads 1,670 Views Citations
A case of a patient positive for anti-cardiolipin antibodies with recurrent fetal wastage and cerebral infarction who was successfully treated with Sairei-to, low dose aspirin, and heparin (Articles)

Taro Nonaka, Makoto Chihara, Izumi Ooki, Masaki Tamura, Takumi Kurabayashi, Koichi Takakuwa

Open Journal of Obstetrics and Gynecology Vol.2 No.4，November 20, 2012

DOI: 10.4236/ojog.2012.24082 4,269 Downloads 6,588 Views Citations
Metastatic Carcinoma of the Uterine Cervix from Rectal Carcinoma: A Case Report and Review of the Literature (Articles)

Motoki Matsuura, Masato Tamate, Masahiro Suzuki, Tasuku Mariya, Sakura Takada, Yuta Tabuchi, Mizue Teramoto, Seiro Satohisa, Ryoichi Tanaka, Masahiro Iwasaki, Kaori Fukunaka, Noriyoshi Fukunaka, Satoshi Tanaka, Tsuyoshi Saito

Open Journal of Obstetrics and Gynecology Vol.4 No.10，July 15, 2014

DOI: 10.4236/ojog.2014.410085 2,895 Downloads 4,260 Views Citations

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