fine-needle aspiration

n. (Pathology) FNA, removal of tissue or fluid or other material from the body with a fine needle for examination

Needle aspiration biopsy (NAB), also known as fine needle aspiration cytology (FNAC), fine needle aspiration biopsy (FNAB) and fine needle aspiration (FNA), is a diagnostic procedure sometimes used to investigate superficial (just under the skin) lumps or masses. In this technique, a thin, hollow needle is inserted into the mass to extract cells that will be examined under a microscope. Fine needle aspiration biopsies are very safe, minor surgical procedures. Often, a major surgical (excisional or open) biopsy can be avoided by performing a needle aspiration biopsy instead.
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[as-per-AY-shun]
The removal of tissue or fluid with a needle for examination under a microscope. Also called needle biopsy.