JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Knee biopsy tissue. Surgeon using a scalpel and needle to place a sample of tissue in liquid wax. The tissue was removed from a patient's knee during an arthroscopy, a keyhole procedure used to diagnose knee problems such as arthritis and inflammation. Tissue removed during the procedure (biopsy) is frozen in wax and later examined to help diagnose infections.
Model release not required. Property release not required.