Masafumi Koshiyama

Type I ovarian tumors, where precursor lesions in the ovary have clearly been described, include endometrioid, clear cell, mucinous, low grade serous, and transitional cell carcinomas, while type II tumors, where such lesions have not been …

Summary Background: Adenomyomectomy and myomectomy are treatment options to reduce dysmenorrhea and to preserve fertility. Recently, the number of adenomyomectomies and myomectomies performed has gradually increased. On the other hand, an i…

Müllerian adenosarcomas are rare tumors that occur in only 8% of uterine sarcomas (1). This tumor is an uncommon variant of mixed mesodermal tumor (MMT) of the uterus, and exhibits a malignant stroma and a benign glandular element. In usual…

Adenocarcinomas arising from adenomyosis uteri are rare. This study reports four such cases and characterizes them clinically and microscopically. In all four patients, the endometrial cytology was negative, and MR imaging and ultrasound so…

OBJECTIVE: To investigate the correlation between benign gynecologic diseases and hormone-dependent malignancies such as endometrial carcinoma in postmenopausal women. DESIGN: We retrospectively analyzed the prevalence of myoma uteri and ad…