tailieunhanh - Ebook Diagnostic imaging nuclear: Part 2

(BQ) Part 2 book "Diagnostic imaging nuclear" presents the following contents: Head and neck, thyroid and parathyroid, Gastrointestinal, genitourinary, HemeOnc procedures and therapies, oncology, other. | Diagnostic Imaging Nuclear MR of patient at left shows enhancement of a soft tissue mass . Calvarial enhancement confirms metastatic involvement 3. Typical Left Coronal PET shows focal hypermetabolic activity in perineural spread of head and neck carcinoma . Right Coronal CE T1WI MR of patient at left shows enhancement in the region of the cavernous sinus signifying perineural spread and corresponding to focal hypermetabolic activity on PET. Typical Left Axial PET shows two focal hypermetabolic lesions in patient with primary CNS lymphoma that metastasized throughout brain. Right Axial T2WI MR of patient at left shows two focal enhancing masses corresponding to focal hypermetabolic activity on PET. Radiation Necrosis vs Recurrent Tumor Key Facts Terminology Includes edema arteritis leukoencephalopathy mineralizing microangiopathy necrotizing leukoencephalopathy posterior reversible encephalopathy syndrome PRES radiation injury radiation-induced tumors Imaging Findings Multivoxel MRS Characteristic patterns in recurrent tumor radiation necrosis 600 Diagnostic Imaging Nuclear FDG PET Tendency for increased metabolism in recurrent tumor low in radiation necrosis However FDG PET currently not typically reimbursed for radiation necrosis vs. recurrent brain tumor Top Differential Diagnoses Abscess Multiple Sclerosis Vascular Dementia Progressive Multifocal Leukoencephalopathy Pathology XRT Spectrum from edema to cavitating WM necrosis demyelination coagulation necrosis Favors WM Diagnostic Checklist Distinguishing residual recurrent neoplasm from XRT necrosis difficult using morphology alone MRS FDG PET Tl-201 or Tc-99m sestamibi SPECT all options for recurrent tumor from radiation necrosis Fused FDG PET T1 MR shows lack of metabolic activity in region of enhancement at site of XRT consistent with radiation necrosis 3. Same patient as next image. 601 Diagnostic Imaging Nuclear FDG PET in same patient as previous image shows lack of metabolic activity in region of .