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F-18 fluorodeoxyglucose uptake in leiomyomatous uterus
M Shida1, M Murakami, H Tsukada
1Department of Obstetrics & Gynecology, Tokai University School of Medicine, Kanagawa 159-0198, Japan.
Summary
Uterine leiomyomas can show high FDG-PET uptake, mimicking malignancy. This case highlights a potential pitfall in diagnosing benign uterine fibroids using FDG-PET in premenopausal women.
Area of Science:
- Gynecologic Oncology
- Nuclear Medicine Imaging
- Diagnostic Pathology
Background:
- Uterine leiomyomas are common, necessitating differentiation from leiomyosarcoma for appropriate treatment, especially conservative management.
- Accurate diagnosis of benign leiomyoma is challenging due to imaging limitations, including magnetic resonance imaging, particularly with myoma degeneration.
- Whole-body positron emission tomography (PET) with F-18 fluorodeoxyglucose (FDG) is increasingly used for malignancy diagnosis, but its gynecologic application requires clarification.
Observation:
- A case presented with increased FDG uptake in a myomatous uterus.
- Pathological examination confirmed the uterine mass as benign leiomyoma following hysterectomy.
- Immunohistochemical analysis revealed glucose transporter-1 positivity in endometrial tissue but negativity in the leiomyoma.
Findings:
- The study observed significant FDG uptake in pathologically confirmed benign uterine leiomyoma.
- Glucose transporter-1 expression was absent in the leiomyoma tissue, contrasting with endometrial tissue.
- This finding suggests a potential for false-positive FDG-PET results in cases of uterine leiomyoma.
Implications:
- Increased FDG uptake in the myomatous uterus can represent a diagnostic pitfall for F-18 fluorodeoxyglucose-positron emission tomography (FDG-PET).
- This case underscores the need for careful interpretation of FDG-PET scans in premenopausal women with uterine leiomyomas.
- Further research is warranted to establish optimal FDG-PET utilization guidelines in gynecologic oncology to avoid misdiagnosis of benign uterine conditions.
