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Ultrasound-guided fine-needle aspirate and biopsy technique Copyright © 2006 Sound Technologies, Inc. Sound Technologies, Inc. 5817 Dryden Place Carlsbad, CA 92008 1-760-918-9626 www.soundvet.com www.soundveteducation.com Introduction
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Copyright © 2006 Sound Technologies, Inc.
5817 Dryden Place
Carlsbad, CA 92008
This presentation describes the methods to use as well as other factors to consider when performing an ultrasound-guided fine-needle aspirate (FNA) or core biopsy. The scanning planes used for FNA and core biopsy are the same. The technique varies somewhat, and the differences are demonstrated. Animation is used to demonstrate the aspirate/biopsy techniques. Please note that this animation will not run properly with older versions of PowerPoint or PowerPoint viewer.
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Rock/slide the probe
Keep needle in
plane of beam
Reset (exit) program
There are many indications for ultrasound-guided aspirates and biopsies as there are essentially no pathognomonic lesions in ultrasound. Most of the time a cytologic or histopathologic sample is needed to make a definitive diagnosis. Samples for cytology and histopathology may obtained with ultrasound-guided, laparoscopic and surgical procedures.
Icterus/liver enzyme elevation/elevated bile acids
Focal nodules or masses anywhere
Renal disease sometimes (i.e. renal dysplasia, renal masses, lymphosarcoma suspects)
Free abdominal fluid
U/S guided FNA/biopsies generally not done on:
Transitional cell carcinoma suspect masses
Chronic renal failure, glomerulonephritis
Currently there is a lack of consensus about the accuracy of ultrasound-guided fine needle aspirates and biopsies compared to surgical or post mortem biopsy sample results. Some studies report high accuracy, others, low accuracy. The differential diagnosis and case presentation both should be considered when determining the best method of obtaining a cytology or histopathology sample.
to left side of screen
Schematic of the
Opposite reference marker
to line up the lesion
to a “reachable” position
can be toward the edge
or in the center
of the beam
Deep lesion needs
to be lined up
toward the edge of
as the beam
See rotated views
Rotated views of the
Needle is placed in the plane of the beam
Aim needle more perpendicular to beam
Aim needle more parallel to beam