Ultrasound images of Pseudoaneurysms and arteriovenous fistulae

These may sometimes form as a result of vascular damage during biopsy procedures. They are usually
not significant and tend to resolve spontaneously (Fig.ultrasound images below).
Pulsatile venous waveform is seen as a result of a small arteriovenous fistula following biopsy

An arteriovenous fistula shows an irregular knot of vessels on colour or power Doppler with a pulsatile
venous waveform and high peak and end diastolic velocity in the feeding artery. A large draining
vein may also be seen.
A pseudoaneurysm may appear cystic on the grey-scale image, but will demonstrate filling on
colour Doppler with a pulsatile flow velocity waveform (Fig. ultrasound images below). Careful biopsy technique helps to avoid such lesions
ultrasound images Colour Doppler demonstrates arterial flow.
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