[Fine-needle biopsy under echographic control in nonpalpable breast lesions. Technical aspects].

Fine-needle biopsy under ultrasound guidance is widely used in the diagnosis of subclinical breast lesions seen on mammograms. This minimally invasive procedure requires little time and is reliable for the diagnosis of lesions in a central or peripheral (axillary extension, upper part of the superomedial quadrant, mammary fold) location, or in small-sized breasts. The procedure is done in real time, allowing reliable verification of the specimen. The cytologic results are available almost immediately. Close collaboration between the radiologist and pathologist is essential.