Figure 2

(A–D) Representative ¹⁸F-FDG PET/CT images of theca fibroma in a 72-year-old woman who sought medical help for two weeks because of pain in the precordial area and difficulty breathing. The maximum intensity projection (MIP, A) showed no significant increase in ¹⁸F-FDG uptake in the rest of the body except in the pericardial area (red arrow). Axial CT (B, arrow) showed a mass of first order soft tissue density on the left side of the pelvic cavity, and no significant uptake of ¹⁸F-FDG was observed on the corresponding PET/CT fusion (C, arrow). Axial PET/CT reveals that the lesions shown on the MIP map are pericardial effusions with increased diffuse uptake of ¹⁸F-FDG (D, red arrow). In addition, an intermediate pleural effusion without increased uptake of ¹⁸F-FDG was seen in the right thoracic cavity (D, yellow arrow). (E–H) Representative ¹⁸F-FDG PET/CT images of granulosa cell tumor (adults type) in a 45-year-old woman who sought medical attention for one month due to right chest pain. The MIP map shows a shadow with slightly increased ¹⁸F-FDG uptake in the lower abdomen (E, arrow). Axial CT (F) showed that the lesion was a soft tissue mass (white arrow) with low density cystic degeneration (red arrow) in the pelvic cavity. The axial PET/CT (G) of the corresponding site showed a mild increase in ¹⁸F-FDG uptake in the solid part (white arrow) of the tumor, with a SUVmax of 2.4, while no radioactive uptake was observed in the cystic area (red arrow). Axial PET/CT at the chest level showed a small amount of fluid in the right thoracic cavity without radioactive uptake (H, yellow arrow), and the amount of fluid accumulation is significantly lower than the amount of fluid accumulation in the serous cavity caused by serous cavity effusion.