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Click A 57-year-old male with multifocal solitary fibrous tumors of the retroperitoneum and pancreas. FDG PET/CT scan demonstrates no convincing evidence of FDG-avid malignancy. However, there is evidence for non-FDG avid recurrent leiomyosarcoma in the abdomen and retroperitoneum. There is slow but significant interval growth of the left psoas and perisplenic soft tissue masses. Although these are FDG nonavid, the interval growth suggests possible residual non-FDG avid malignancy. Recommend clinical correlation and consideration of biopsy if indicated, particularly in light of the patient's remote history of a diaphragmatic leiomyosarcoma in this region. (Protocol: Whole body MIP images from PET/CT, Axial fusion images from PET/CT, 120 kVp, 2.5 mm slice thickness, 120 mL Omnipaque 350, venous phase acquisition, 18 mCi F-18 FDG was injected and imaging was performed at 60 minutes. Protocol: Axial fusion images from PET/CT, CT information is as above. 12.7 mCi was injected and the patient was imaged at 55 minutes.)

Click A 57-year-old male with multifocal solitary fibrous tumors of the retroperitoneum and pancreas. Tc-99m sulfur colloid SPECT scan, showing normal uptake in the reticuloendothelial system. There is no significant uptake of radiotracer within the pancreatic tail mass in distinction to the high activity seen within the adjacent spleen, proving the mass is not a splenule. (Protocol: 5.467 mCi Tc-99m sulfur colloid given IV, Imaging performed at 5 minutes.)