Physiologic Menstrual 18 F-FDG Uptake in Uterine Didelphys Mimicking Metastasis in a Patient With Ovarian Immature Teratoma.

Yoon, Joon-Kee; Park, Yong-Jin; An, Young-Sil · Clin Nucl Med · 2026

case_report · Level V

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Abstract

A 27-year-old woman with ovarian immature teratoma underwent 18 F-FDG PET/CT for preoperative staging, which revealed intense FDG uptake in 2 distinct pelvic structures, mimicking primary endometrial cancer or metastasis. Although MRI showed no anatomic lesions in either uterus, it confirmed uterine didelphys-a rare Müllerian duct anomaly. This case illustrates that physiological menstrual uptake within a duplicated uterus can simulate malignancy. Clinicians must recognize such anatomic variants to avoid diagnostic pitfalls and accurately stage pelvic malignancies on PET/CT.

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