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Click CT axial images of a 58 year-old man with (unknown) retroperitoneal fibrosis, undergoing initial PET/CT to evaluate for potential lymphoma. CT shows an infiltrative soft tissue mass surrounding left common iliac artery and vein causing minimal compression of the vessels. (5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 112 mAs.)

Click Fused PET/CT axial images of a 58 year-old man with (unknown) retroperitoneal fibrosis, undergoing initial PET/CT to evaluate for potential lymphoma. Shows diffuse moderate FDG activity corresponding to CT soft tissue abnormality seen as an infiltrative soft tissue mass surrounding left common iliac artery and vein causing minimal compression of the vessels. (Performed 60 minutes after injection of FDG tracer, dose of 17.53 mCi, with 5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 112 mAs.)

Click CT axial images of a 58 year-old man with retroperitoneal fibrosis at diagnosis. (Follow-up PET/CT scan performed 3 months after initial PET/CT - 4 months after onset of symptoms) CT study demonstrates circumferential soft-tissue thickening around the distal aorta and common iliac vessels. This has progressed since the first PET/CT study. (5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 280 mAs.)

Click Fused PET/CT axial images of a 58 year-old man with retroperitoneal fibrosis at diagnosis. (Follow-up PET/CT scan performed 3 months after initial PET/CT - 4 months after onset of symptoms) Demonstrates circumferential soft-tissue thickening around the distal aorta and common iliac vessels, as well as associated diffuse moderate FDG activity within the soft tissue. This has progressed since the first PET/CT study. (Performed 60 minutes after injection of FDG tracer, dose of 17.2 mCi, with 5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 280 mAs.)

Click CT axial images of a 58 year-old man with retroperitoneal fibrosis following steroid therapy. CT study shows complete resolution of the soft tissue infiltration around the aorta and iliac vessels. (5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 294 mAs.)

Click Fused PET/CT axial images of a 58 year-old man with retroperitoneal fibrosis following steroid therapy. Shows complete resolution of the soft tissue infiltration around the aorta and iliac vessels and complete resolution of the abnormal FDG activity. (Performed 60 minutes after injection of FDG tracer, dose of 16.7 mCi, with 5 mm slice thickness, CT-based attenuation correction algorithm using two iterations and 8 subsets, 120 kVp, 294 mAs.)