A Sentinel Node scan is a test to identify the first lymph node that drains your tumour. This is called the sentinel node. A small amount of radioactivity is used to obtain pictures of this node to guide your surgeon when you have your surgery.
Nuclear medicine sentinel lymph node scan
![Nuclear medicine sentinel lymph node scan icon](https://www.esht.nhs.uk/wp-content/themes/esht2017/img/file-icon-32.png)