PMC9364014_01
Positron emission tomography (PET) showed abnormal accumulation of FDG in left ovary (A). This finding was not present a year ago (B). Pelvic magnetic resonance imaging (MRI) showed left ovarian tumor (150mm x 92mm x 116mm) with low intensity on T1-weighted image (C) and high intensity on T2-weighted image (D).
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Positron emission tomography with 2-deoxy fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (18-FDG-PET/CT) revealed an abnormal accumulation of FDG in the left ovarian mass (Fig. 1); this was not observed with 18-FDG-PET/CT performed a year previously. T1-weighted images and high intensity on T2-weighted images (Fig. 1). Two weeks after these tests, her abdomen was suddenly distended, and she was admitted to our hospital.
Gross finding of ovarian tumor (A). Small cell carcinoma cells with a high N/C ratio were found and are accompanied by glandular structures containing intracellular mucus (B). Immunohistchemical staining of the metastatic ovarian tumor cells was positive for CD56 (C) and MIB-1 (D).
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Pathological examination of the left ovarian tumor revealed small-cell cancer with a partial glandular structure (Fig. 2).