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SCIENTIFIC EXHIBIT |
1 Department of Internal Medicine, Division of Nuclear Medicine (P.D.S., R.L.W.)
2 Department of Radiology (Y.A.), B1G412 University Hospital, University of Michigan Medical Center, 1500 E Medical Center Dr, Ann Arbor, MI 48109
3 Department of Nuclear Medicine, Veterans Affairs Medical Center, Ann Arbor, Mich (P.D.S.).
A rapidly emerging clinical application of positron emission tomography (PET) is the detection and staging of cancer with the glucose analogue tracer 2-[fluorine-18]fluoro-2-deoxy-D-glucose (FDG). Proper interpretation of FDG PET images requires knowledge of the normal physiologic distribution of the tracer, frequently encountered physiologic variants, and benign pathologic causes of FDG uptake that can be confused with a malignant neoplasm. One hour after intravenous administration, high FDG activity is present in the brain, the myocardium, and—due to the excretory route—the urinary tract. Elsewhere, tracer activity is typically low, a fact that allows sensitive demonstration of tracer accumulation in many malignant neoplasms. Interpretive pitfalls commonly encountered on FDG PET images of the body obtained 1 hour after tracer administration can be mistaken for cancer. Such pitfalls include variable physiologic FDG uptake in the digestive tract, thyroid gland, skeletal muscle, myocardium, bone marrow, and genitourinary tract and benign pathologic FDG uptake in healing bone, lymph nodes, joints, sites of infection, and cases of regional response to infection and aseptic inflammatory response. In many instances, these physiologic variants and benign pathologic causes of FDG uptake can be specifically recognized and properly categorized; in other instances, such as the lymph node response to inflammation or infection, focal FDG uptake is nonspecific.
Index Terms: Emission CT (ECT), **.121632 • Fluorine • Neoplasms, diagnosis, **.30 • Neoplasms, emission CT (ECT), **.12163, **.30
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