Fine needle aspiration cytology (FNAC) entails using a narrow gauge (25-22G) needle to collect a sample of a lesion for microscopic examination. It allows a minimally invasive, rapid diagnosis of tissue but does not preserve its histological architecture.
Aspiration cytology (sample collection) from a variety of organ sites is useful in the determination of pathological states, particularly neoplasms & inflammatory conditions. Most common nodes examined include breast, liver, kidney, lung, prostate, pancreas, retroperitoneum, salivary glands, thyroid & lymph nodes.