Sequential 18F-FDG and 68Ga-FAPI-04 PET/CT in Early Peritoneal Recurrence of Signet-Ring-Component Rectal Adenocarcinoma.
A 60-year-old man with signet-ring-component poorly differentiated rectal adenocarcinoma (pMMR, HER2-negative, KRAS/NRAS/BRAF wild-type) received total neoadjuvant therapy, low anterior resection, and adjuvant CAPOX. During biochemical progression (CEA 7.85 → 171.0 µg/L over ∼4 mo), 18F-DG PET/CT showed postoperative/a...