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99mTc-sulfur-colloid SPECT lymphoscintigraphy. Anterior (A) and right-lateral (B) transmission images obtained 30 min after injection of 99mTc-sulfur-colloid into the left breast show the injection site (solid arrow) and focal uptake (dashed arrow) in the sentinel node in the right axilla. This research was originally published in the Journal of Nuclear Medicine (see ref 263). Copyright 2006 Society of Nuclear Medicine and Molecular Imaging, Inc.
