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).
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.
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
procedure.
procedure.
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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