Fig. 4
18F-FDG PET-CT images of patients. A Image of a 61-year-old male patient with type 1 AIP, demonstrating diffuse enlargement of the pancreas. (arrows). The serum IgG4 level was 2260.0 mg/dL, and the TLG2.5 was 413.8 g/ml×cm3. According to the Nomogram, his relapse probability is more than 95%. The patient discontinued steroid use during the maintenance phase, and 7 months later, he relapsed, with imaging showing diffuse re-enlargement of the pancreas. B Image of a 60-year-old male patient with type 1 AIP, showing focal enlargement in the head of the pancreas (arrows). The serum IgG4 level was 980 mg/dL, and the TLG2.5 was 92.7.0 g/ml×cm3. According to the Nomogram, the patient’s relapse probability is less than 50%. After symptom relief, the patient did not receive maintenance treatment, and has been followed up for 4 years without relapse