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Nuclear Medicine Breast Lymphoscintigraphy. A radioactive material has been injected into the breast tissue (the large dark area in the right of each picture) in a patient with breast cancer. The injected drug then moves in the lymph channels to the lymph nodes in the arm pit ('axilla'), seen here as a string of black dots. These will be removed at surgery and examined for the possible presence of tumor cells. The results will help determine the patient's treatment choices.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.