GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Flushing cancer patient's catheter. Close-up of a liquid-filled syringe being used to flush out a peripherally inserted central catheter (PICC) line in the arm of a 76-year-old man with bowel cancer. Catheters like this are used to deliver chemotherapy.
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