3. ULTRASOUND NOMENCLATURE
• Anechoic: no echoes, appears black on screen- gall bladder,
urinary bladder, vascular structure, cyst
• Hypoechoic: less reflective and less amount of echoes, appears
gray on screen- prostate, medullary pyramids, LN
• Hyperechoic: highly reflective and echo rich, appears white/light
gray- bone, diaphragm, calculus
• Isoechoic: having similar echogenicity to neighbouring structure
• Homogenous: organ parenchyma uniform in echogenicity
• Heterogenous: organ parenchyma not uniform in echogenicity
6. COUINAUD CLASSIFICATION
• Divides liver functionally into eight segments
• Each segments has its own vascular supply and biliary
drainage
7. SONOGRAPHIC ANATOMY:LIVER
• Normal liver is homogenous
and contain fine level of
echoes
• Portal veins have echogenic
wall
• Hepatic veins have
imperceptible wall
8. • Echogenicity compared with renal cortex and spleen
-minimally hyperechoic or isoechoic than renal cortex
-hypoechoic than spleen
• Mean longitudinal diameter in MCL :10.5 cm +/- 1.5 SD
• Normal range in adults :9 to15 cm
• Main portal vein : <12 mm in diameter
• Hepatic vein: < 6.2 mm
12. GALL BLADDER
• Flask shaped, blind ending diverticulum attached to the
bile duct by cystic duct
• Lies in the inferior margin of liver between segments IV
and V
• Parts : fundus, body and neck
• Phrygian cap: anatomic variant created due to folding of
fundus on its body
13. SONOGRAPHIC ANATOMY
• Appearance: pear
shaped, anechoic
structure with well defined
hyperechoic wall
• Size:
-length: 7 to 10 cm
-width: 2.5 to 4 cm
-height: 2.75 cm
• Wall thickness: <3 mm
15. BILIARY TREE
• System of ducts that
collect and deliver bile
from liver to second part
of duodenum
• Parts:
-intrahepatic
-extrahepatic
• Size: (diameter)
-CHD/CBD: <6 mm
-first order branches: <2mm
16.
17. BILIARY DILATATION
• Mean diameter of CBD in pediatrics group increases
gradually
- Neonate: 1.2 mm
- 17 year: 2.3 mm
• Biliary dilatation in pediatrics group without symptoms and
other sonographic/ lab abnormality shows benign clinical
course
• Widening of duct with increasing age in old age:
controversial
• After cholecystectomy there is slight physiological dilatation
of duct, most case 1-3 mm over baseline
18. PANCREAS
• Sits behind the stomach
• Lies transversely across
posterior abdominal wall
at the level of L2 and L3
• Parts: head, uncinate
process, neck and tail
19. SONOGRAPHIC ANATOMY
• Shape, size and
echogenicity varies
considerably
• Echogenicity is usually iso
to hyperechoic compared
with liver parenchyma
• Size: (diameter)
-head: 0.6 to 2.8 cm
-body: 0.4 to 2.3 cm
-tail: 5 to 2.5 cm
20. KIDNEYS
• Located retroperitoneally
in the posterior abdominal
wall on either side of
vertebral column
• Bean shaped
• Renal parenchyma:
cortex and medullary
pyramids
• Size:
-length: 8 to 12 cm
-width: 4 to 6 cm
-thickness: 2.5 to 3.5
21. SONOGRAPHIC ANATOMY
• Echogenicity
-capsule: smooth, echogenic
line around kidney
-cortex: typically less
echogenic than liver
-medulla: hypoechoic than
cortex
-sinus: hyperechoic
22. SPLEEN
• Appear inverted comma
shape
• Splenic parenchyma is
homogenous
• Echogenicity is higher as
compared to liver
• Size:
-length (l) : 9 to12 cm
-width (w) : 7 cm
-thickness (t) : 5 cm
23. URINARY BLADDER
• Best evaluated when
moderately filled
• Appear as anechoic
structure with echogenic,
thin smooth walled almost
rectangular shape
• Wall thickness:
-fully distended: < 3mm
-nondistended: < 5mm
24. PROSTATE
• Lies between bladder neck and urogenital diaphragm
• Appear homogenous, hypoechoic and bounded by
capsule
• Size:
-AP: 3 to 4 cm
-width: 2 to 3 cm
-craniocaudal: 3.5 to 5 cm
• Volume: < 25 gm
25.
26. UTERUS
• Thick walled, pear shaped, hollow muscular organ
• Parts: fundus, body and cervix
• Position: most frequently anteverted – anteflexed
• Size: varies depending on patient age and gravidity
- length: 4.5 to 9 cm
- AP diameter : 1.5 to 3 cm
- transverse: 4.5 to 5.5
• In multipara size increase by 1 to 2 cm in all diameters
28. SONOGRAPHIC ANATOMY
• Myometrium is normally homogenous structure with
fine parallel linear echoes
• Endometrium:
-menstruation: thin, hyperechoic line and may contain fluid
-proliferative: thickens slightly and develops multilayered
appearance, also known as trilaminar
-secretory: thickens and becomes uniformly hyperechoic
32. OVARIES
• Lie lateral to uterus in ovarian fossa
• Oval shaped with long axis oriented downward and
forward
• Size:
-nulliparous: 9 ml (maximum)
-reproductive age: 22 ml (maximum)
• Dominant follicle: 20 to 25 mm in diameter at maturity
33. SONOGRAPHIC ANATOMY
• Hypoechoic when
compared with
myometrium
-echoic central area
(corresponding to stroma)
-peripheral area (cortex)
35. ABDOMINAL AORTA
• Continuation of thoracic aorta beginning at aortic hiatus
in diaphragm and ends at 4th lumbar vertebra
• Divides into common iliac arteries
39. APPENDIX
• Normal appendix is worm
like extension of caecum
• Average length: 8 to 10 cm
• Diameter: < 6 mm
• Appearance: inner
hypoechoic band without
folding