Hi, I recently had a FNA biopsy for an abnormal submental lymph node. In the letter to my GP, the pathology department sent a letter saying they were fairly confident there was no evidence of lymphoma or neoplasm but they have referred the sample for a FISH analysis. I tried googling a FISH analysis but I couldn't really understand what it meant. So can anyone hear explain to me  in simple English what they're looking for in a FISH analysis if the original FNA biopsy showed no sign of any cancer cells??

thank you so much