68Ga-FAPI PET/CT Depicted the Fibrosis of Ischemic Colitis

Ischemic colitis is the most common form of ischemic bowel disease; identification of ischemic colitis with PET/CT is rare. We present a case of unexplained ischemic colitis in a 66-year-old man who underwent 18 F-FDG PET/CT to exclude intestinal malignancy and was subsequently recruited in a clinical trial regarding 68 Ga-FAPI. 18 F-FDG PET/CT showed intense activity in the intestinal lumen where mucosa had chronic inflammation. Conversely, 68 Ga-FAPI PET/CT revealed high tracer uptake in the intestinal wall and adjacent mesentery. Our case showed the different distribution pattern of 18 F-FDG and 68 Ga-FAPI in ischemic colitis.