advanced usg lounge
TRANSCRIPT
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ADVANCED USG LOUNGE
SPIRAL CT MRI PET-CT CENTRE SEC 44 –C CHANDIGARH
www.spiralctmricentre.com
Dr Arun Gupta Director imaging Dr Rakhee gupta Dr R K S Gandhi Dr Vinayak Mittal Dr Ritesh Mahajan
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SONO EMBRYOLOGY
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SONO EMBRYOLOGY
VITTELOINTESTINAL DUCT
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VITELLOINTESTINAL DUCT /YOLK STALK
OMPHALOMESENTERIC DUCT
The endodermal connection between the mid-gut and the
yolk sac. During embryonic disc folding (human week 3) this structure is initially a
broad open connection which is then restricted to a narrow tube and
finally closed between the mid-gut and the
yolk sac.
Yolk sacembroy
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YOLK SAC ATTTACHED TO EMBROY THROUGH VITTELOINTESTINAL DUCT
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The constituents of the vitelline duct
vitelline veins ( Paired) (omphalomesenteric vein,The blood vessels
which form in the yolk sac and have a blood flow towards the embryo. Derived from the extra-embryonic mesoderm surrounding the endoderm of the yolk sac.
vitelline arteries ( Paired) . (omphalomesenteric artery The blood
vessels which form in the yolk sac and have a blood flow away from embryo. Derived from the extraembryonic mesoderm surrounding the endoderm of the yolk sac.
Vitellogenesis The term refers to the formation of yolk.
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Doppler values of Vitelline artery
Low velocity No diastolic flow PSV : 5.8
+_1.7cm/sec PI : 3.24 +_.94
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3D Rendered image
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Fetal anomaly series ………..
ARACHNOID CYST
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Arachnoid cyst …..a brief
Arachnoid cysts are benign intracranial non communicating
collections in the arachnoid memberane. USUALLY STABLE CAN OCCUR INTRACRANIALLY OR IN SPINAL CANAL ALSO. EVEN IF LARGE ( RARELY CAUSE SYMPTOMS)
MID LINE CYSTS MAY LEAD TO PITUITARY DYSFUNCTION. MAY INTERFERE WITH CSF CIRCULATION.
COMMON LOCCATIONS ARE :1. SYLVIAN FISSURE / TEMPORAL FOSSA2. POSTERIOR FOSSA 3. ALONG CEREBERAL CONVEXITY4. MIDLIINE ( SUPRASELLAR)
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ARACHNOID CYST ………….
FETAL MR IMAGE
CSF SIGNAL LARGE CYSTIC LESION IN THE LEFT TEMPORO-PARIETAL REGION ( SYLVIAN FISSURE CONFINES)/SUPRASELLAR / POSTERIOR FOSSA REGION.
( NEARLY OCCUPYING ALL THE COMMON SITES WHERE
ARACHNOID CYST IS PRESENT )
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Fetal MR and Multiplanar USG Reformation.
FETAL MR SAGITTAL IMAGE
MASS EFFECT IS APPRECIATED ON BRAIN STEM INDENTATED ALONG THE VENTRAL SURFACE
USG SECTIONAL PLANE IMAGING OF LARGE INTRACRANIAL CYST
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Coronal images ….Fetal MR / USG
NORMAL VERMIS / CEREBELLAR HEMISHERE( RULES OUT DANDY-WALKER MALFORMATION)
USG ( CORONAL PLANE )
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DIFFERENTIAL DIAGNOSIS FOR ARACHNOID CYST
MIDLINE Cavum veli interpositi Aneurysm of vein of
galen ( Midline cysts may
accompany corpus callosum dysgenesis so in supratentorial cysts corpus callosum should be assessed) .
Posterior fossa : Dandy walker
malformation Inferior vermian
hypoplasia Mega cisterna
magna Blake’s pouch
cysts
DEPENDS ON POSITION
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Diagnostic Ultrasound
4th Edition
Carol M. Rumack
Stephanie R. Wilson
J. William Charboneau
Deborah Levine
References