Conversation: The conversation between human and AI assistant.
[|Human|] What is under the collarbone?  I have a lump there detected by a PET scan.  I was getting the scan for a lump I felt which is just above the collarbone on my right side of neck but they said they saw one behind my collarbone on the same side.  What is that area called?
[|AI|]  Hi, Lump behind the collar bone and in front could be a lymph node. The region above the collar bone or clavicle is called supraclavicular area and below is the sub clavicle area. Lymph nodes are enlarged in surrounding area infections or epithelial tumors metastasizing. If it is superficial., you can ask your doctor for a procedure called as fine needle aspiration cytology. If it is deep ultrasound guided procedure of fine needle aspiration cytology can be done. It will most probably identify the cause of enlargement. If you have any further queries, happy to help again.