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Introduction: Right adnexal spindle cell tumors are rare and often pose diagnostic and therapeutic challenges. This case highlights the significance of accurate diagnosis and optimal management for improved outcomes in postmenopausal women. Aims & Objectives To present a case of a benign right adnexal stromal tumor, emphasizing its diagnostic challenges, the role of imaging and histopathology, and the importance of individualized surgical management in postmenopausal women with adnexal masses. Material & Methods A 64-year-old postmenopausal woman presented with an incidentally detected right adnexal mass during ultrasonography. Clinical examination, MRI, and CA-125 levels were performed. Laparotomy with total hysterectomy, bilateral salpingo-oophorectomy, and omentectomy was undertaken. Intraoperative frozen section showed spindle cell tumor without malignancy. Histopathological examination confirmed benign stromal tumor (fibroma) with no necrosis or atypia. Preoperative findings, intraoperative observations, and postoperative histopathological diagnosis were integrated to establish a comprehensive management approach. Postoperative recovery was uneventful. Results The right adnexal mass measured 14x12 cm with moderate ascites. Frozen section revealed benign spindle cell features, confirmed by histopathology as a stromal tumor (fibroma) with no sarcomatous features. Associated findings included atrophic endometrium, leiomyomata, and chronic cervicitis. Preoperative CA-125 was normal (35.5 U/mL), and cytology showed no malignant cells. The patient?s postoperative recovery was uneventful, demonstrating successful management. This case underscores the value of integrating preoperative imaging, intraoperative evaluation, and histopathological findings in confirming benignity. Conclusion This case highlights the importance of comprehensive diagnostic evaluation and precise surgical intervention for adnexal spindle cell tumors. Integrating clinical, radiological, and histopathological findings is essential to avoid overtreatment and ensure optimal patient outcomes. Multidisciplinary collaboration is key in managing rare adnexal tumors, emphasizing the need for accurate diagnosis, careful surgical planning, and individualized patient care, especially in postmenopausal women presenting with adnexal masses.