[Characteristics of physiological uptake of uterus and ovaries on XXXX positron emission tomography].

@entity1 @entity530 @entity5 @entity419
OBJECTIVE: To observe the characteristics of the physiological uptake of uterus and ovaries on @entity419 positron emission tomography (FDG PET). METHODS: A total of 288 PET examinations performed in 247 @entity1 (164 with @entity5 , 44 with benign diseases, and 39 without remarkable abnormality) were included for analysis, and clinical follow-ups were applied for at least 10 months to exclude @entity530 . The menstrual statuses, menstrual cycles, and related pelvic examinations with other modalities were inquired before each PET examination. PET scanning was performed from pelvis to neck with a Siemens ECAT EXACT HR + system. The uptake levels of uterus and ovaries were set as intense, moderate, and mild by comparing to liver uptake. RESULTS: In 116 @entity1 (131 examinations ) with regular menstruation, the endometrial uptake, usually in inverted cone shape surrounded by relatively low-uptake uterine wall, was observed with two peaks in the early menstrual flow phase and in the mid-cycle respectively; the ovarian uptake was more prominent in the mid-cycle, with the foci of uptake in ovoidal shape and located at the left and/or right side superior-posterior to the bladder. From the early menstrual flow phase to the late secretory phase of the menstrual cycles, the probabilities of mild uptake in both endometrium and ovaries were 7%, 86%, 80%, 58%, 20%, 40%, 64%, and 59%, respectively, indicating that the late menstrual flow phase and the early proliferative phase had the least probability of intense or moderate uptake. No intense uptake was observed in the 17 @entity1 (19 examinations) presenting remarkably irregular menstrual cycle, 112 @entity1 (136 studies) in menopause for 3 months to 39 years, and 2 @entity1 without menstruation yet. Only one @entity1 within 1 year of menopause and a 14-year-old @entity1 expected to start menstruation showed mild to moderate uptake in the endometrium. CONCLUSION: The physiological endometrial and ovarian uptakes have specific shapes and positions on @entity419 PET images, which correlates well with the menstrual phases.
