ISUOG Basic Training Distinguishing Between Normal and Abnormal Appearances of the Fetal Anatomy
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1 ISUOG Basic Training Distinguishing Between Normal and Abnormal Appearances of the Fetal Anatomy Reem S. Abu-Rustum, Lebanon
2 Learning Objective At the end of the lecture you will be able to: Compare the differences between the ultrasound appearances of normal fetal anatomy and of the more common structural fetal abnormalities. Editable Basic training text here
3 Key Questions Which abnormalities can be excluded by obtaining normal HC and AC sections in the 2 nd or 3 rd trimester fetus? What are principal differences in ultrasound appearances between a structurally normal fetus and a fetus with open spina bifida? How can the AC section be used to exclude the most common abdominal wall and gastrointestinal defects? What are the typical ultrasound features of lower urinary tract obstruction? Editable Basic training text here
4 Key Anatomic Planes
5 Scanning Planes
6 Scanning Planes
7 Scanning Planes
8 Image Orientation ANTERIOR RIGHT LEFT POSTERIOR Editable Basic training text here
9 Image Orientation ANTERIOR Cephalad Caudad POSTERIOR Editable Basic training text here
10 Determining Fetal Lie Ant Maternal R Maternal L Post Editable Basic training text here
11 Key Features of HC Section
12 Key Features of HC Section * 1. Midline (falx cerebri) 2. Cavum septum pellucidum 3. Rugby football shape, rounded at back, more pointed at front 4. Skull contour regular 5. Posterior horn <10.0mm 6. Anterior horn(s) slit-like Falx CSP T 3V T Lateral Ventricle Editable Basic training text here
13 Measure BPD & HC
14 Posterior Fossa Falx * T T Cerebellum Editable Basic training text here
15 Key Features of AC Section
16 Key Features of AC Section 1. Short length of umbilical vein, opposite spine 2. Single stomach bubble, on left side 3. Remaining echotexture homogeneous 4. (Gall bladder to right of UV) UV S * * DAo Sp Editable Basic training text here
17 Measure AC
18 Establishing Situs L Schematic adapted from Abuhamad & Chaoui. Practical Guide to Fetal Echocardiography: Normal and Abnormal Hearts. 2 nd Edition Editable Basic training text here
19 Establishing Situs
20 First Establish Fetal Position
21 4 Chamber View Easy view to obtain No specialized skill needed Obtainable in all fetal positions Rules out 60% CHD Easy slide up from AC with full rib Starting point for the sweep Editable Basic training text here
22 4 Chamber View Normal Appearance Right ventricle is the most anterior, below the sternum Left atrium is closest to the spine and the most central structure in the chest Tricuspid valve is more apical than the mitral valve Flap of the foramen ovale is in the left atrium Moderator band is in the right ventricle L DAo Sp R Crux seen Editable Basic training text here
23 Kidneys Normal Appearance Editable Basic training text here
24 Kidneys Normal Appearance Lateral to spine Posterior to stomach Normal renal tissue similar echogenicity to bowel, liver etc * Sp * (Coronal view allows easier comparison) Cortex homogenous echopattern Renal pelvis, centrally positioned, <7.0mm AP Editable Basic training text here
25 Cord Insertion Normal Appearance 1. Slide inferiorly from AC to sacrum 2. Maintain cross sectional approach 3. Cord inserts superior to bladder Editable Basic training text here
26 Bladder Normal Appearance Central position in fetal pelvis Anterior to rectum Thin walled No internal content Size varies (~30 minute cycle) * Umbilical artery on each side Editable Basic training text here
27 Key Features to Measure FL
28 Key Features of Amniotic Fluid Editable Basic training text here
29 Axial Anatomic Planes
30 Normal or Abnormal Appearances? Skull 1.Brain, level of ventricles 2.Brain, post fossa 3.Chest 4 chamber view 4.Abdomen stomach 5.Cord insertion/abdominal wall 6.Kidneys and bladder 7.Amniotic fluid 8.Size and relative size Editable Basic training text here
31 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
32 Finding the HC - Shape 1.Dolichocephaly 2.Brachycephaly 3.Anencephaly 4.Encephalocele 5.Lemon sign 6.Cystic hygroma 7.Craniocynostosis Editable Basic training text here
33 Dolichocephaly Schematic adapted from: Editable Basic training text here
34 Brachycephaly
35 Anencephaly
36 Encephalocele
37 Lemon Sign
38 Cystic Hygroma
39 Craniocynostosis
40 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
41 Finding the HC Intracranial Structures 1.Ventriculomegaly 2.Holoprosencephaly Editable Basic training text here
42 Ventriculomegly
43 Holoprosencephaly
44 Finding the Posterior Fossa Intracranial Structures 1.Banana sign 2.Vermian agenesis Editable Basic training text here
45 Banana Sign
46 Vermian Agenesis
47 The Spine
48 Open Spina Bifida Typical Appearances normal appearances Editable Basic training text here abnormal appearances
49 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
50 Finding the 4 Chamber View 1.Situs abnormalities 2.Ectopia cordis 3.Univentricle 4.AV canal 5.CDH Editable Basic training text here
51 Abnormal Situs
52 Ectopia Cordis
53 Univentricle
54 Atrioventricular Septal Defect R L Loss of Off-Set Editable Basic training text here
55 Congenital Diaphragmatic Hernia H L R S L R H Loss Off-Set S Editable Basic training text here
56 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
57 Finding the AC 1. Establishing situs 2. Absent stomach: esophageal atrsia 3. Double bubble: duodenal atresia Editable Basic training text here
58 Establishing Situs
59 Absent Stomach 15 Mins Later Editable Basic training text here
60 Absent Stomach
61 Double Bubble Sign
62 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
63 Cord Insertion/Abdominal Wall 1.Normal gut herniation 2.Omphalocele 3.Gastroschisis Editable Basic training text here
64 Normal Gut Herniation Fetuses have exompholos at 9-10 weeks that resolves by 12 weeks Editable Basic training text here
65 Omphalocele Abnormal cord insertion cord inserts into apex of defect contains liver +/- bowel etc membrane covered Editable Basic training text here
66 Gastroschisis Normal cord insertion defect below and to right of cord insertion contains bowel only free floating Editable Basic training text here
67 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
68 Kidneys and Bladder
69 Kidneys and Bladder 1.Renal agenesis 2.Hydronephrosis 3.Bladder outlet obstruction Editable Basic training text here
70 Urinary Tract Obstruction 1. Appearances dependent on site of obstruction unilateral or bilateral 2. Amniotic fluid volume oligo/anhydramnios bilateral and/or low normal fluid - unilateral Editable Basic training text here
71 Renal Agenesis
72 Hydronephrosis
73 Bladder Outlet Obstruction
74 Bladder Outlet Obstruction
75 Normal or Abnormal Appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
76 Oligohydramnios: Causes Editable Basic training text here Ultrasound in Obstetrics & Gynecology: A Practical Approach. Abuhamad et al 2014
77 Polyhydramnios: Causes Editable Basic training text here Ultrasound in Obstetrics & Gynecology: A Practical Approach. Abuhamad et al 2014
78 Normal or abnormal appearances? 1.Skull 2.Brain, level of ventricles 3.Brain, post fossa 4.Chest 4 chamber view 5.Abdomen stomach 6.Cord insertion/abdominal wall 7.Kidneys and bladder 8.Amniotic fluid 9.Size and relative size
79 Size and Relative Size
80 Key points 1. The key to identifying abnormalities is understanding the range of normal appearances at differing gestations 2. It is important to develop a consistent approach to each scan, rather than scanning randomly 3. Find the long axis of the fetus first and assess the appearances Editable Basic training text here
81 Key points 4. Then assess the fetal anatomy in cross section starting with the head, assess skull and intracranial anatomy, measure the HC 5. Slide through the chest to the abdomen, assess situs, chest contents and upper abdomen, measure AC 6. Find FL by continuing to slide through lower abdomen and pelvis, assess abdominal wall, cord insertion, kidneys, bladder, spine and skin covering Editable Basic training text here
82 Conclusions Distinguishing between normal and abnormal ultrasound appearances requires: The development of a consistent scanning technique Paying rigorous attention to the quality of sections obtained Understanding how to manipulate the probe to improve poor sections Appreciating how the range of normal appearances, and therefore potentially abnormal appearances, changes with gestation Editable Basic training text here
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