According to a study published recently in the Journal of Neurosurgery, neurosurgeons at the Barrow Neurological Institute at St. Joseph’s Hospital and Medical Center in Phoenix, Ariz. found that the pen-sized microscope could help them precisely identify where tumor tissue ends and healthy tissue begins. A laser microscope that picks up fluorescently-dyed cells could result in more precise tumor extraction during brain surgery, and streamlined workflows in the operating room.