2. Period.. 13w od to 27w 6d
Majority between 18-20 w
Routinely performed on all preg women
Emphasizes on fetal anatomy so named …
Fetal Anomaly Scan
2nd
Trimester Anatomy Scan
TIFFA (Targeted Imaging For Fetal Anomalies)TIFFA (Targeted Imaging For Fetal Anomalies)
ScanScan
9. MeasurementMeasurement
The outer table of the skull on the superior end of the image upto theThe outer table of the skull on the superior end of the image upto the
inner table of the skull at the inferior end of the imageinner table of the skull at the inferior end of the image
BPD
10. Not useful when the head shape is abnormal i.e, elongated or excessively roundNot useful when the head shape is abnormal i.e, elongated or excessively round
..
BPD is commonly affected by fetal position. Eg. Breech presentationBPD is commonly affected by fetal position. Eg. Breech presentation
Better to use the parameter ofBetter to use the parameter of CEPHALIC INDEX (CI)CEPHALIC INDEX (CI), instead of BPD alone., instead of BPD alone.
Also, the CI remains constant during the 3Also, the CI remains constant during the 3rdrd
trimester.trimester.
Cephalic Index (CI) = BPD / OFD X 100Cephalic Index (CI) = BPD / OFD X 100
26. Measured by adding the values of individual amniotic pocket depths (in cm's) forMeasured by adding the values of individual amniotic pocket depths (in cm's) for
each of the four quadrantseach of the four quadrants
Pocket chosen is free from the cord or any fetal part or placental tissue.Pocket chosen is free from the cord or any fetal part or placental tissue.
The normal range for amniotic fluid volumes varies with gestational age.The normal range for amniotic fluid volumes varies with gestational age.
AFI of < 5 OligohydramniosAFI of < 5 Oligohydramnios
5 - 25cm NORMAL5 - 25cm NORMAL
AFI of > 25 PolyhydramniosAFI of > 25 Polyhydramnios
27. MAXIMAL VERTICAL POCKETMAXIMAL VERTICAL POCKET
<< 2 cm : Oligohydramnios 2 cm : Oligohydramnios
> 8 cm : Polyhydramnios> 8 cm : Polyhydramnios
2-8 Cm Normal
28. fetal anatomy assessment
Its imp to go through all-complete coverage--> then
no major abnormalities will be missed
29. Head & Brain
Cranial structures to Note at routine anat. Scan
1.Head shape
2.Ventricle
3.CSP
4.Thalamus
5.Cist Magna
6.Nuchal fold
7.cerebellum
31. ANENCEPHALYANENCEPHALY
No skull vault / cranium is seen.No skull vault / cranium is seen.
Brain tissue absentBrain tissue absent
ACRANIAACRANIA
Cranium is absentCranium is absent
Major part of the brain tissue mayMajor part of the brain tissue may
present .present .
Replaced by flattend amorphous massReplaced by flattend amorphous mass
(EXENCEPHALY)(EXENCEPHALY)
33. MENINgoCELEMENINgoCELE
When it contains only meningesWhen it contains only meninges
MENINgoENCEPHALoCELEMENINgoENCEPHALoCELE
Brain tissue is included in theBrain tissue is included in the
herniated tissue.herniated tissue.
CEPHALoCELE
Intracranial tissue herniates
Through a defect in cranium
34. May be seen as a purely cysticMay be seen as a purely cystic
mass or may contain echoes frommass or may contain echoes from
herniated brain tissue.herniated brain tissue.
If the mass appears cystic, theIf the mass appears cystic, the
Meningoecele componentMeningoecele component
predominatespredominates, while a solid masssolid mass
indicates predominantly anindicates predominantly an
EncephaloceleEncephalocele.
Larger encephalocoeles may showLarger encephalocoeles may show
accompanying microcephaly.accompanying microcephaly.
36. Atrial Width
Most useful and accepted
Must be taken on true axial view
Measured at widest part of ventricles
Inner to inner vent walls
10-12 borderline
12-15 moderate
>15 severe
38. May be Unilateral orMay be Unilateral or
Bilateral.Bilateral.
Usually transient & benign.Usually transient & benign.
Seen in fetus normallySeen in fetus normally
between 16 – 21 weeks, afterbetween 16 – 21 weeks, after
which they start regressingwhich they start regressing..
39. HOLOPROCENCEPHALY
Resulting from incomplete separation of theResulting from incomplete separation of the
two hemisherestwo hemisheres
3 types… ALOBAR3 types… ALOBAR
SEMILOBARSEMILOBAR
LOBARLOBAR
40. No inerhemisheric division..they
are fused
Absent Corpus Callosum
Single ventricle….Horse-shoe
Thalami fused
Absent olfac tract
ALOBA
R
44. DANDY-WALKER MALFORMATION
1. Cystic dilatation of 4th
vent.
Communicating with post fossa
2. Enlarged post fossa
3. Elevated Tentorium
4. Hypoplastic or absent vermis
45. Dandy-Walker Variant
Less severe form of classic DWM
Partial Hypoplasia of vermis
Partial 4th
vent obstruction
Not much enlargement of post fossa
47. Physiological Emptying : TransientPhysiological Emptying : Transient
Lack Of Amnionitc Fluid ToLack Of Amnionitc Fluid To
SwallowSwallow
Oligohydramnios Oligohydramnios
Anhydramnios Anhydramnios
Impaired Fetal SwallowingImpaired Fetal Swallowing
Esophageal AtresiaEsophageal Atresia
Obstructing Oropharyngeal Mass Obstructing Oropharyngeal Mass
Cervical TeratomaCervical Teratoma
Facial CleftsFacial Clefts
CongenitalCongenital
DiaphragmaticDiaphragmatic
HerniationHerniation ::
fetal stomach may be absentfetal stomach may be absent
in an axial ultrasound scan –in an axial ultrasound scan –
standard view due tostandard view due to
migration into the thoraxmigration into the thorax
Absent stomach bubble
49. 2nd
bubble equal or smaller than stomach bubble
Shows communication with stomach
D/D…Duodenal atresia
Choledochal cyct
Duplication cyst
Double bubble sign
Another bubble adjacent to stomach bubble
Other than GB
D.atresia
50.
51. Look for ant abd wall with cord insertion…
Para-umbilical abdominalPara-umbilical abdominal
wall defectwall defect..
Herniation fetal bowel loopsHerniation fetal bowel loops
occasionally portions oroccasionally portions or
the stomach and or liver intothe stomach and or liver into
amniotic cavityamniotic cavity
GASTROSCHISIS
Free floating
Not Covered
GASTROSCHISIS
52. Midline abdominal wall defectsMidline abdominal wall defects
Herniation of intra abd contentsHerniation of intra abd contents
into base of cordinto base of cord
OMPHALOCELE
56. Fetal kidney seen from 14 wks
Can be identified through renal art
Renal agenesis..renal artery are also absent
B/L Ren agenesis associated with oligo /anhydramnios
Measurement of Renal pelvis AP diam
inner to inner aspect of pelvis
upper limit 4-5 mm in 2nd
trimester
Look for Renal cystic ds
UROGENITAL SYSTEM
57. Fetal bladder visible after 12 wk
Over distended bladder
B/L Hydro-urtero nephrosis
Obstructive uropathy
93. Occupy 1/3 – ½ of thorax
Cardiac position & situs is
Imp
Apex points toward Lt
Lt atr close to spine
Rt Vent close to chest wall
HEART
94. 2 ventricles/ walls of equal size
2 atria / walls of equal size
Foramen ovale moving in left atrium
Pulmonary veins entering left atrium
Motion of mitral valves (left side) regular
Motion of tricuspid valves (right side) regular
Continuity of interventri septum
Check at a Glance
95. The ultrasound beam is directed
perpendicular to the midchest
plane at the level of the heart.
These chambers consist of the
right and left atrial and both
ventricular chambers
Corresponding valves between
them
Four-Chamber View