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- Sheng-Che Lin, Ruoh-Fang Yen, and Yen-Kung Chen.
- Department of Nuclear Medicine and PET Center, Shin Kong Wu Ho-Su Memorial Hospital.
- Medicine (Baltimore). 2020 Mar 1; 99 (10): e18988.
IntroductionCarbohydrate antigen 19-9 (CA 19-9) is a tumor glycolipid, frequently elevated in the serum of patients due to malignancies from gastrointestinal organs; in particular, the pancreas. This carbohydrate antigen is also expressed in benign diseases.Patient ConcernsA case of a 27-year-old female who has an unknown origin CA 19-9 elevation for 2 years.DiagnosisAfter the left ovarian cystectomy and microscopic examination, the final diagnosis is a dermoid cyst. The dermoid cyst shows increased F-fluorodeoxyglucose (F-FDG) uptake in the F-FDG positron emission tomography (PET)/computed tomography (CT) study.Intervention And OutcomesThe laparoscopic oophorocystectomy was performed. It was observed that the patient's CA 19-9 level returned to normal after the surgery 6 months later. This showed that the dermoid cyst was responsible for the abnormal CA 19-9 level.ConclusionIn this case, we can learn that the F-FDG PET/CT scan has potential use in patients with unknown origin of elevation CA 19-9.
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