Imaging abdomen trauma renal part 5 Dr Ahmed Esawy
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Transcript of Imaging abdomen trauma renal part 5 Dr Ahmed Esawy
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RENAL TRAUMA
Injury to the kidney is seen in approximately 8%–10% of patients with blunt or
penetrating abdominal injuries The vast majority (80%–90%) of cases involve
blunt rather than penetrating injury.
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Active bleeding
•The CT appearance
of intraperitoneal
blood depends on the
age and physical
state of the clot.
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• IMMEDIATELY AFTER
HEMORRHAGE, INTRAPERITONEAL
BLOOD HAS THE SAME
ATTENUATION AS CIRCULATING
BLOOD OF 20-30 HU
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• Relation to other layers
• The renal fascia relates to the other layers in the following manner (moving from innermost to outermost) :
• renal cortex
• renal capsule
• perinephric fat ( or "perirenal fat
• renal fascia
• paranephric fat ( or "pararenal fat
• peritoneum ( anteriorly), and transversalis fascia posteriorly
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Types of renal haemorrhege
according to the site:
• Intra-renal .
• Sub-capsular.
• Peri-renal.
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Classification of Injury
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Grade I
• Contusion
– Hematuria
– Urologic studies N
• Hematoma
– Subcapsular
– Non expanding
– Parenchyma N
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Grade II
• Hematoma
– Perirenal
– Nonexpanding
• Laceration
– < 1.0 cm
– Renal cortex only
– No urinary
extravasation
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Grade III
• Laceration
– > 1.0 cm
– Renal cortex only
– No urinary
extravasation
– Intact collecting
system
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Grade IV
• Laceration
– Renal cortex
– Renal medulla
– Collecting system
• Vascular
– Main renal
artery/vein injury
with contained
hemorrage.
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Grade V
• Completely
shattered kidney.
• Avulsion of renal
hilum (pedicule)
which
devascularizes
kidney.
Kennon et al. Radiographic assessment of renal trauma: our 15-year
experience. The Journal of Trauma, 154: 353-355; August 1995.
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Pedicule Injury
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Category I Renal contusion
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Category I Subcapsular hematoma
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Category I Simple renal laceration
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Category I Subsegmental renal infarction
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Category II Major renal laceration involving the collecting sysem
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Category III Multiple renal laceration (Shattered Kidney)
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Category III Traumatic occlusion of main renal artery
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Category IV Ureteropelvic junction injuries
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Coil embolization of the right renal artery
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Renal contusion : (category 1) .focal area of
decreased contrast enhancment in the interpolar
region of left kidney
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Subcapsular haematoma (category 1)
subcapsular fluid collection flattening the
posterolateral contour of the left kidney. There is
minimal cortical laceration
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Simple renal laceration (category I) small hypoattenuating
laceration crossing the interpolar region of the left kidney
assocaited with perinephric collection . also hepatic laceration
and haemoperitoneum in the morrison pouch
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Subsegmental renal infarction (category I ) sharply
demarcated wedge interpolar region of right kidney
note also subtle haemorrhage in right renal hilum
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Major renal laceration involving the collecting
system (category II) .large distracted renal
fracture through the interpolar portion of right
kidney with dye extravasation
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Multiple renal laceration (category III) .several
deep laceration of the interpolar region of the
right kidneyassociated with areas of active arterail
extravasation
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Schattered kidney (category III)devitalized upper pole of the
right kidney due to degmentalk infarction(R) .note the
perinephric hyperattenuating blood clot (arrow) .also flattened
IVC indicate hypovolaemic shock
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Traumatic occlusion of the main renal artery (category III). IVP
demonstrated poor visualization of the left kidney . CT show rim
enhancment of the outer cortex of the left kidney .DSA show
Ttaperd occlusion of proximal left main renal artery
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Traumatic occlusion of right main renal artery .CT
show no enhancment of right kidney
(infarcted).retrograde opacification of renal vein .
Angiogram shows occlusuion of main renal artery
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Ureteropelvic junction laceration with pre-existing
obstruction (category IV)
pelviectasis,blood clot in the renal pelvis,periureteral
urinoma,perinephric extravasation
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The capsule maintains the reniform contour as a hematoma compresses the kidney. This subcapsular renal hematoma is consistent with an acute process, which is hypoechoic with some mixed echoes caused by the early deposit of fibrin
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Axial CT section without intravenous contrast, showing a relatively hyperdense rightsided subcapsular haematoma (arrow). b. Axial contrast CT section demonstrates the right kidney is compressed with a delayed nephrogram relative to the left kidney.
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Contrast enhanced CT of the abdomen demonstrates a moderate-sized left subcapsular hematoma which compresses the renal parenchyma (arrow). The left nephrogram is slightly diminished and there is no excretion of contrast by the left kidney. A wedge-shaped low density laceration is seen in the anterior midpole of the left kidney (arrow). There is mild infiltration of the left perinephric fat (arrow), but no large perinephric hematoma is seen.
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Perirenal hematoma
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Truma of horse show kidney (MRI)
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Associations with renal injury
: Fractures of the lower ribs transverse processes of the
spine;
posterior abdominal wall and psoas sheath hematomas.
Adrenal gland injury: is rare, The Imaging of choice is CT showing adrenal hemorrhage, adrenal contusion and laceration and veiling of the periadrenal fat.
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Right perinephric haematoma . Renal vessels visible . Poor
uptake of contrast
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Axial CT scan showing perinephric haematoma following trauma to a
previously unrecognised obstructive hydronephrosis
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CT examination: Unenhanced (on the left side) and contrast-enhanced (on the right side),
axial scans: In the plain scan, well-defined subcapsular fluid can be observed on the dorsal
surface of the left kidney (arrow). In the right picture, after the intravenous injection of contrast
material, the renal parenchyma and the renal capsule can be better differentiated from the
haemorrhage (arrow).
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Axial contrast-enhanced CT section through the kidneys showing extravasation
of contrast (arrow) from the left kidney, due to traumatic forniceal rupture.
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Blunt renal trauma. Entire collecting system, ureter and
bladder filled with a blood clot.
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G5
Devascularisation of left kidney
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Renal Trauma Images - Devascularised Kidney
Classification: Grade 5
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Other Problems to be Considered:
• Renal pseudofracture
Renal pseudocapsular hematoma
Renal pseudoextravasation
Renal tumor with hemorrhage
Hematoma of extrarenal origin
dissecting into the Gerota space
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• contusions are perceived as ill-
defined or sometimes sharply
marginated areas of reduced
enhancement and excretion
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Kidney trauma. Grade 2 renal injury, subcapsular and perinephric hematomas. Contrast-enhanced CT scan of the abdomen on a patient with hematuria after a motor vehicle
collision shows an ill-defined fluid collection in the left perinephric space. There is also a subcapsular hematoma with deformity of the renal parenchyma.
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Kidney trauma. Grade 2 renal injury, perinephric hematoma. Contrast-
enhanced CT scan of the abdomen on a patient with hematuria after a motor
vehicle collision shows an ill-defined fluid collection in the left perinephric space
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Kidney trauma. Grade 3 renal laceration. CT scan of the abdomen after intravenous contrast administration shows
irregular nonenhancing renal parenchymal defect with extension greater than 1 cm deep to near the renal pelvis. Delayed
image showed no urinary contrast extravasation
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Kidney trauma. Grade 4 renal injury segmental infarction. Contrast-enhanced
CT scan of the upper abdomen shows a segmental area of nonenhancement in
the upper medial left kidney without associated renal laceration.
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Kidney trauma. Grade 4-5 renal injury. Lacerations extending to the collecting system.
Contrast-enhanced CT scan of the abdomen in a patient with hematuria after a motor
vehicle collision shows deep lacerations extending into the collecting system of the right
kidney. Extension into the collecting system is confirmed by urinary contrast
extravasation on delayed image through the kidney in excretory phase
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Grade 5 renal injury. Shattered left kidney. Contrast-enhanced CT scan of the
abdomen in a patient with hematuria after a motor vehicle collision shows several deep
lacerations extending into the collecting system of the left kidney with separation of the fragments
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Grade 5 renal injury. Partial ureteropelvic junction tear and multiple deep
lacerations. Contrast-enhanced CT scan of the abdomen in a patient involved in
a motor vehicle collision shows multiple deep renal lacerations with perinephric
fluid extending into the renal hilum
Delayed image shows
urinary contrast extravasation
development of a
urinoma, in spite of initial
treatment with stent
placement
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Grade 5 renal injury. Shattered kidney. Contrast-enhanced CT scan of
the abdomen in a patient with hematuria and hypotension after a motor vehicle collision
shows transection of the right kidney with a large hematoma around and between the 2
halves of the kidney. The 2 halves are both perfused because there were 2 renal arteries
Delayed images show urinary contrast extravasation
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Grade 5 renal injury. Shattered kidney with renal vein thrombosis (incomplete).
Abdominal radiograph after intravenous contrast administration shows absent
right nephrogram. CT scan (Image 35) shows shattered kidney and renal vein
thrombus extending slightly into the inferior vena cava.
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Grade 5 renal injury, devascularization.
Contrast-enhanced CT scan of the abdomen
in a 52-year-old man after an assault shows
dissection of the origin of the left renal
artery, with no perfusion of the left kidney.
Also, a hematoma can be noted along the
anterior renal fascia Four-week follow-up shows no change, ie,
no trace of renal cortical rim enhancement.
An adjacent cystic hematoma along the
anterior renal fascia persists
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After four weeks a small "pool" of layering contrast extravasated
into the hematoma
Kid trauma. Active vascular contrast extravasation. A
male of unknown age after a motor vehicle
collisionwith hematuria and hypotension. CT scan of
the abdomen with contrast shows a small upper pole
laceration on the left with large perinephric
hematomaand a tiny "flame" of intravenous contrast
extravasation..
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Kidney trauma. Active vascular contrast extravasation. A 35-year-old man presented
with hypotension and hematuria following a motor vehicle accident. This contrast-
enhanced CT scan shows a perinephric hematoma with central high attenuation,
which probably represents active bleeding
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Intravenous and oral contrast
material
• Intravenous contrast enhancement is essential
for abdominal CT. Without intravenous contrast
enhancement, solid-organ injuries such as
renal lacerations can often be imperceptible. In
addition, active arterial extravasation is only
detectable with intravenous contrast material
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Perinephric haematoma
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RENAL ARTERY OCCLUSION AFTER ABDOMINAL TRAUMA