general abdominal imaging peritoneal space, pancreas, & …radfileshare.cvm.ncsu.edu/jb...
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VMB 960
March 25,
2013
GENERAL ABDOMINAL
IMAGING PERITONEAL SPACE, PANCREAS, & SPLEEN
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Chapters 35-36
Pages 650-678
Chapter 37
Pages 694-701
Chapter 3
Pages 38-49
REFERENCE
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Radiography and
Ultrasound of the Abdomen
Peritoneal &
Retroperitoneal Spaces
Specific Organ Evaluation
Pancreas
Spleen
Patterns of Disease – Mass
Lesions
OBJECTIVES
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NORMAL ABDOMEN
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NORMALLY NOT SEEN…
Abnormal enlargement
Mass effect on adjacent organs
Pancreas
GB
GB
Adrenals
Adrenals
Uterus
Ure
ter Ure
ter
*Don’t forget lymph nodes!*
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NORMAL CAT
Same organ pattern
Spleen smaller
Often better serosal detail
Increased fat
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ULTRASOUND
Pros (compared to Radiographs)
Great for evaluating soft tissue
changes
Real-time imaging
Cons
Does not provide global picture
Highly dependent on user
The two modalities complement
each other
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ULTRASOUND PHYSICS
US probe emits sound waves into tissue
US probe also listens for echoes
Echo VOLUME (how loud?)
Echo TIMING (how long?
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ULTRASOUND PHYSICS
Acoustic Impedance
Inherent property of a substance
Determined by
Physical Density
Speed of Sound in the tissue
Two tissues with large dif ference
in AI
Creates interface
US waves are reflected (an echo)
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ULTRASOUND PHYSICS
Frequency
Measured in MHz
Range 1-18 MHz
Lower Frequency
Better Penetration
Worse Resolution
Higher Frequency
Better Resolution
Worse Penetration
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ULTRASOUND PHYSICS
Multifrequency probes
For canine abdomen
Average size dog
Use a 5-8 MHz probe
Deep-chested/Large dog
Use a 3-5 MHz probe
For feline abdomen
Can use 10-12 MHz probe
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Hyperechoic
Hypoechoic
Anechoic
Isoechoic
Relative comparison
ULTRASOUND TERMINOLOGY
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SPACES OF THE ABDOMEN
Retroperitoneal
Dorsal to colon
Kidneys, ureters, adrenal
glands, lymph nodes…
Continuous with the
mediastinum
Peritoneal
Surrounds visceral organs
A potential space
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PERITONEAL SPACE
Serosal detail
Dependent on normal
abdominal fat
Poor serosal detail
Poor radiographic technique
Young animal
Peritoneal fluid
Emaciation (no fat)
Peritonitis
Carcinomatosis
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POOR SEROSAL DETAIL
Young animals
Less fat
Brown fat
Lack of fat
Emaciation
Chronic cachexia
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POOR SEROSAL DETAIL
Disease of the peritoneum
Peritonitis
Carcinomatosis
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POOR SEROSAL DETAIL
Peritoneal effusion
Often accompanies other problems (peritonitis)
Fluid and soft tissue are the same opacity
Radiographs less sensitive to detection vs. US
US good to determine cause for loss of detail
Fluid type cannot be specified
For radiographs or US
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PERITONEAL FLUID
Effusions
Heart failure (↑ hydrostatic pressure)
Hypoproteinemia (↓ colloid oncotic pressure)
Capillary permeability (vasculitis)
Inflammation
Neoplasia
Hemorrhage
Urine
Bile
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PERITONEAL FLUID
“Wispy” ST opacity in falciform fat
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POOR SEROSAL DETAIL
Emaciation or fluid?
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CHOLESTEROL GRANULOMA
Bates body
Dystrophic calcification of necrotic mesenteric fat
More common in cats
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PNEUMOPERITONEUM
Gas opacity in the peritoneal space
Abdominal wall penetration
Surgery
Can persist 10-21 days post-sx
Trauma (puncture)
Rupture of a hollow viscus (GI)
SURGICAL EMERGENCY!
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PNEUMOPERITONEUM
Sensitivity of ultrasound
variable
Tend to push superficial
gas out of the way
May detect if trapped
Radiographs
Large volumes outline
the organs
Look at liver and
diaphragm/body wall
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PNEUMOPERITONEUM
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POSITIONAL RADIOGRAPHY
Remember…Gas rises
Manipulate the patient
Manipulate the x-ray beam
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HORIZONTAL
BEAM VD
Left lateral recumbency
to avoid gas in fundus Normal
Right
Right
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RETROPERITONEAL SPACE
Pneumoretroperitoneum
Retroperitoneal space is continuous with the
mediastinum
Rupture of trachea (or esophagus)
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RETROPERITONEAL SPACE
Dorsal to the colon
Fluid, mass displaces colon
ventrally
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RETROPERITONEAL
MASS
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COLON POSITION
Colon and SI subject to
displacement with mass
lesions
However, they are also
variable in normal position
Must see a mass lesion also
(increase in soft tissue
opacity)
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PANCREAS
Dog Cat
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NORMAL PANCREAS - ULTRASOUND
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PANCREATIC ENLARGEMENT
Caudal deviation of colon
Lateral and/or ventral deviation
of duodenum
Silhouetting of greater
curvature of stomach
Pancreatitis
Peritonitis/fluid
Persistent gas distension
of the duodenum
Often difficult to diagnose
radiographically!
Evans. Miller’s Anatomy of the Dog, 3rd ed.
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Normal
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Normal
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PANCREATITIS - ULTRASOUND
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CLASSIC APPEARANCE:
Hypoechoic, enlarged pancreas
Hyperechoic mesentery (inflamed fat)
Peritoneal effusion
Dilated pancreatic duct, bile duct obstruction
SENSITIVITY:
Pancreas can appear
normal with pancreatitis
Dogs
US is a more reliable test,
especially when acute
About 2/3 cases detected
Cats
Less reliable, more often
normal in appearance
About 1/4 to 1/3 cases
detected
PANCREATITIS - ULTRASOUND
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Typically surrounded by fat
Usually easily seen on rads
Head on VD
Tail on Lateral
Not in cats
Sedation effects
Phenothiazine tranquilizers
Anesthetic gases & barbituates
SPLEEN
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SPLEEN
Tail on lateral
Head on VD
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SPLEEN
Tail can be variable in position
Head less mobile
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Breed variants
German Shepherd Dog, Retrievers,
Sighthounds
SPLEEN
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DIFFUSE (Splenomegaly) or FOCAL (Mass)
Radiographs
Diffuse changes and large focal disease
Ultrasound
Can better identify small parenchymal lesions
Specificity of imaging changes are often nonspecific
SPLENIC PATHOLOGY
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DIFFUSE SPLENOMEGALY
Neoplasia
Lymphoma
Mast Cell
Congestion
Sedation
Right heart failure
Splenic Torsion
IMHA
Inflammation
Infarction
Hyperplasia
Extramedullary
hematopoiesis
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Neoplasia
Hemangiosarcoma
Hemangioma
Lymphoma (less common appearance)
Nodular Lymphoid Hyperplasia
Hematoma
Abscess
FOCAL SPLENOMEGALY
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FOCAL SPLENOMEGALY
Head Tail
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FOCAL SPLENIC MASS
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QUESTIONS?