persentasi radiologi awal
TRANSCRIPT
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Gambar 25.35: Chronic occlusion. Long-standing internal carotid artery occlusion results in low-resistance waveform in
the external carotid artery.
Gambar 25.35: Chronic occlusion. hasil oklusi arteri karotis internal .resistansi gelombang rendah di
arteri karotid eksternal
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FIGURE 25-36. Common carotid artery (CCA) occlusion causes abnormal internal carotid artery (ICA) waveform.
A, Antegrade tardus-parvus waveform is seen in an ICA distal to a CCA occlusion.
B, Retrograde external carotid artery(ECA) flow with a tardus-parvus waveform caused by collateral flow from the contralateral ECA to supply the
ipsilateral ICA distal to
a CCA occlusion.
C, Color Doppler image shows antegrade ECA flow (E) with an ECA branch (arrow) and retrograde ICA flow (I);
J, internal jugular vein.
D, Spectral Doppler image shows high-resistance retrograde right ICA flow. E,
High-resistance antegrade flow in
the right ECA distal to a CCA occlusion.
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FIGURE 25-37. Postcarotid endarterectomy
(CEA) appearances. A, Normal post-CEA
changes with a vein patch
(arrows). B, Abnormal wedge of
residual/recurrent plaque/thrombus in newly
symptomatic post-CEA patient. C, Post-CEA
sutures (arrow)
with a residual intimal flap in lumen
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FIGURE 25-38. Carotid stent. A, Normal right carotid stent (arrow) shows complete filling on
color Doppler examination.
B, Transverse image of carotid stent (arrow) in the carotid bulb shows residual plaque
(arrowhead) in the lumen. C and D, Left carotid
stent shows visible narrowing on color Doppler (C) and elevated velocities (D) consistent with a
greater than 70% stenosis using standard
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FIGURE 25-39. Fibromuscular dysplasia. A,
Longitudinal color Doppler image of the
middle to distal portion of the internal
carotid artery (ICA) shows velocity elevationand significant stenosis. B, Same patients
proximal portion of the ICA shows no stenosis.
C, Angiogram demonstrates typical appearance
of fibromuscular dysplasia in the mid-ICA and
distal ICA. Note the beaded appearance
resulting from focal bands (arrow) of thickenedtissue that narrow the lumen.
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FIGURE 25-40. Long-segment stenosis of
common carotid artery (CCA) caused by
Takayasusarteritis.
A, Power Doppler image of left CCA shows long-
segment concentric narrowing caused bygreatly thickened walls of the artery. B, Power
Doppler image of right CCA in same patient
demonstrates similar concentric narrowing
(arrows). C, Right spectral Doppler waveform
shows a mildly tardus-parvus waveform.
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FIGURE 25-41. Carotid artery dissection. A, Abnormal high-resistance waveforms (arrow) at
the origin of the right internal
carotid artery (ICA) with no evidence of flow distal to this point (curved arrow). B, Gray-scaleevaluation of the vessel in the area of
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FIGURE 25-42. Carotid body tumor. A, Transverse image of the carotid bifurcation shows a
mass (arrows) splaying the internal
carotid artery (ICA) and external carotid artery (ECA). B, Pulsed Doppler traces of the carotid
body tumor show typical arteriovenous
shunt (low-resistance) waveform.
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FIGURE 25-43. Ectatic common carotid artery (CCA). Color Doppler image shows ectatic
proximal CCA arising
from the innominate artery (I) and responsible for a pulsatile right
supraclavicular mass
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FIGURE 25-44. Power D Pathologic lymph node near carotid
bifurcation. oppler image shows a malignant lymph
node (arrow) lateral to the carotid bifurcation.
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FIGURE 25-45. Pseudoaneurysm of the common
carotid artery (CCA). Transverse image of the left distal
CCA (C) demonstrates a characteristic to-and-fro waveform in the
neck of the large pseudoaneurysm (P), which resulted from an
the pulsatility and resistive indices of the blood vessels. attempted central venous line
placement.