Fig. 3
From: Identifying the deceiver: the non-neoplastic mimickers of genital system neoplasms
IgG4-related prostatitis. A 32-year-old man with well-established IgG4-RD underwent PET/CT for evaluation of disease activity. a Axial plane PET/CT images revealed an FDG-avid nodular lesion (arrows) in the prostate gland. Because of the patient’s medical history, prostatic involvement of IgG4-RD was considered primarily. Patient declined histopathological evaluation, and preferred close follow-up. b Follow-up multiparametric prostate MRI 4 years after the initial PET/CT examination showed no significant change in size in the 4-year interval. Axial T2-weighted image and ADC map (b = 1000 s/mm2; 1.5 T), respectively, demonstrate T2-hypointense lesion with low ADC values (arrowheads)