Adenomatoid tumor of the uterus and xanthogranulomatous inflammation of the ovary are very rare lesions. This case report is to document both lesions in a patient with diabetes mellitus. A postmenopausal patient, ultrasonographic examination revealed 72*42mm cystic lesion in adnexial region and 120*40mm sized collection of intraabdominal fluid. The patient had diabetes mellitus for 6 years. Total abdominal hysterectomy and bilateral salphingooferectomy were performed. The pathology report came out as uterin adenomatoid tumor, ovarian xanthogranulomatous inflammation, abcess formation in the same fallopian tube. This is the first reported case, both lesions in the same patient. Immunesupression is the common etiologic factor for both lesions. Uncontrolled diabetes mellitus resulting in impaired leukocyte function and immunocompromised status may be predisposing factors. Preoperative diagnosis of both adenomatoid tumor and xantogranulamatous inflammation may be important in avoiding aggressive surgical intervention but mostly the exact diagnosis can only be made by pathologic examination.