Conversation: The conversation between human and AI assistant.
[|Human|] My father just had a PET scan done. The Dr. said that it showed that he has cancer cells but they dont know where the cancer is. Is this normal? He wants him to wait 4 months and come back. That seems like a long time to me with no form of meds or treatment plans.
[|AI|]  Hi. Your father has a condition called carcinoma of unknown primary site. Usually patients present with enlarged lymph node which on pathological examination show cancer cell metastases. This usually occurs in the head and neck but can also occur elsewhere. Patient needs a complete ENT examination, blind biopsies from several sites from the head, throat. CT MRI and PET scan often help. The pathologist can do an IOC and give an indication of the likely origin of the tumor. But inspire of all these, several patients continue to have metastases without obvious primary cancer. The treatment of these will involve multiple modalities and often radiotherapy to the involved nodes may be necessary