"Needle aspiration" refers to a medical procedure where a needle is used to remove fluid or tissue from the body for diagnostic purposes. Full definition
The easiest and least invasive way to sample a growth is to have your veterinarian do a fine needle aspiration of the lump in question. (baywoof.com)
To confirm the diagnosis, a sample of bone marrow, obtained by needle aspiration or needle biopsy, may be required to confirm the diagnosis. (brittonroadveterinaryclinic.com)
Your veterinarian may use a test called a fine needle aspiration to take a sample of cells for testing in the laboratory. (dog-health-guide.org)