The aspir-gun: when to draw: the technique of aspiration biopsy.

Aspiration biopsy cytology or fine needle aspiration is a well-established, safe, highly reliable, inexpensive diagnostic procedure which must be distinguished from the more familiar needle biopsy'. The Aspir-Gun, a plastic syringe pistol', makes the technique simple enough for use in a solo practitioner's office. Since it is cheaper to send slides to referral centres than patients, it has a special screening value for doctors in isolated areas. Indications are discussed, with emphasis on those anatomic sites and palpable masses, which have practical application for the primary care physician.