Contents. Review anatomy of the urinary tract Imaging modalities
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1
2 Contents Review anatomy of the urinary tract Imaging modalities
3 The Urinary Tract
4 Kidneys
5
6 ตาแหน งไต (position) อย ใน retroperitoneum ระด บ T12-L3 โดยไต ขวาจะม ระด บตากว าไตซ ายเล กน อย ร ปร าง (shape) คล ายร ปถ ว ด านเว าห นเข าทาง medial ท ศทางการวางต ว Long axis ของไตเอ ยงขนานไปก บเงาของ (axis) psoas muscle ขนาด (size) ยาวประมาณ cm. กว าง 6 cm. หนา 4 cm. หร อประมาณ 3-4 lumbar vertebral bodies ขนาดของไตสองข างต างก นได ไม เก น 1.5 cm. ความหนาของ renal ประมาณ cm. cortex (cortical thickness) ขอบ (outline) ขอบเร ยบเสมอก น
7 Kidneys 1. Renal capsule Gerota s capsule Adipose capsule Fibrous capsule 2. Renal parenchyma Cortex Medulla 3. Renal sinus Renal pelvis Artery, vein lymph, nerves Fat
8 Renal Capsule Renal capsule: 3 layers I. Gerota s capsule II. Adipose capsule III. Fibrous capsule
9 Renal Capsule Renal capsule: 3 layers I. Gerota s capsule II. Adipose capsule III. Fibrous capsule
10 Renal Capsule Renal capsule: 3 layers I. Gerota s capsule II. Adipose capsule III. Fibrous capsule
11
12 Renal Parenchyma
13 Renal Sinus
14
15 Associations
16 Renal Vessels
17 Film KUB
18 IVP 5 MINS IVP/IVU
19 Ultrasound
20 Computed Tomography (CT scan)
21 Magnetic resonance imaging (MRI)
22 Ureters
23 Ureters
24 Film KUB IVP 10 Minutes
25 Physiologic narrowing of ureter I. Ureteropelvic junction (UPJ) II. Distal ureter that cross bifurcation of iliac vessels III. Ureterovesical junction (UVJ)
26 Physiologic Narrowing (1)
27 Physiologic Narrowing (2)
28 Physiologic Narrowing (3)
29 Urinary Bladder
30 Urinary Bladder
31 Urinary Bladder
32 Urethra
33 Urethra
34 Urethra
35 Normal male urethrogram
36
37 Investigations 1. Plain KUB 2. Intravenous pyelography (IVP) 3. Retrograde pyelography (RP) 4. Cystography 5. Voiding cystourethrography (VCUG) 6. Ultrasonography 7. CT scan 8. Magnetic resonance imaging 9. Renal angiogram 10. Renogram
38 Plain KUB
39 Plain KUB 1. Soft tissue shadow 2. Abnormal calcification 3. Free air or free fluid 4. Bony structure
40 Soft tissue shadows: Kidneys Psoas muscles Uterus Bladder Liver Spleen
41 Soft tissue shadows: Kidneys Psoas muscles Uterus Bladder Liver Spleen 1. Position 2. Shape 3. Axis 4. Size 5. Cortical thickness 6. Outline
42 Soft tissue shadows: Kidneys Psoas muscles Uterus Bladder Liver Spleen
43 Soft tissue shadows: Kidneys Psoas muscles Uterus Bladder Liver Spleen Retroperitoneal mass?
44 Right psoas abscess
45 Intraperitoneal mass
46 ? DDx. - Urinary tract stone - Calcified granuloma - Tumor - Gallstone - Appendicolith - Costochondral calcification - Atherosclerosis - Phlebolith - Prostatic calculi - Calcified uterine fibroid
47 ? Example: There is an ovalshaped calcification at left L1-L2 paravertebral level, overriding lateral margin of left psoas muscle. These findings are suspected of left UPJ stone.
48 UPJ stone
49 Calyceal stone
50 Staghorn stone
51
52
53 Emphysematous pyelonephritis
54 I. Spine II. Lower ribs III. Sacrum IV. Pelvis V. Hip & SI joints Look for - Fracture - Congenital bony defect - Bony destruction
55
56 สร ป: การอ าน Plain KUB 1. Soft tissue shadow 2. Abnormal calcification 3. Free air or free fluid 4. Bony structure
57 Intravenous Pyelography (IVP)
58
59 IVP *** Intravenous injection of iodinated contrast medium to evaluate for renal anatomy and function 1. Standard IVP (50 ml contrast medium) 2. Double dose IVP (100 ml contrast medium)
60 Factors 1. Kidney function GFR 2. Intrarenal concentration: State of hydration, osmotic diuresis 3. Exit of contrast from kidney (collecting system dynamics): Rate of urine flow, volume of collecting system, ureteral dynamics
61 IVP: Preparation Fluid restriction Increase visualization of contrast media Except for patients with poor renal function, DM, multiple myeloma, trauma, young child Bowel preparation To clear fecal content Not absolutely needed
62 IVP: Contraindication 1. Allergy to iodinated contrast media 2. Renal insufficiency (Creatinine Clearance < 30) Pregnancy Note: Cr Clearance = (140-age)xBW(kg) 72xserum Cr (mg/dl) If female (x0.85)
63 IVP: Evaluation 30 min, full bladder 3 min. Post void 10 min. 5 min.
64 Scout Film
65 Normal Nephrogram 3 min.
66 3 min: Nephrogram 1. Position 2. Shape 3. Axis 4. Size 5. Cortical thickness 6. Outline
67 Normal Excretion 3 min. 5 min.
68 5 min: Excretion 1. Minor/major calyx 2. Renal pelvis Abnormalities - Clubbing calyx/ hydronephrosis - Filling defect - Anomaly - Dense nephrogram
69 10 min: Pelvocalyeal system and ureter 5
70 Scout film Findings of UPJ obstruction 3 mins 5 mins 10 mins
71 Scout 5 min 10 min
72 Hydronephrosis
73 Double collecting system
74 10 mins 30 mins
75 Right UVJ stone causing obstruction scout 10 mins post void
76 Bilateral hydronephrosis & hydroureters 1. Bladder cause 2. Urethra cause
77 Filling Defects
78 30 min: Full bladder 1. Size 2. Shape 3. Position 4. Architecture 5. Density
79 Irregular bladder outline Multiple bladder diverticulum Bladder trabeculation
80 Bladder filling defects
81 Post voiding film 1. Residual urine 2. Small tumor 3. Small stone
82 IVP: Indication 1. Renal and ureteric calculi 2. Colicky abdominal pain 3. Persistent or frank hematuria 4. Complicated urinary tract infection 5. Urothelial tumors 6. Abnormal US or renogram
83 IVP 1. Can evaluate renal function 2. Can demonstrate urothelium 3. Can visualize the ureter 1. Unable to identify renal parenchymal abnormality 2. Need IV contrast renal failure
84 Retrograde Pyelography (RP)
85 Retrograde Pyelography (RP)
86 RP: Indication 1. Poor kidney excretion 2. Evaluate pelvocalyceal system if uncertainty from IVP 3. Unexplained hematuria
87 RP: Contraindication 1. Urinary tract infection
88 RP: Complication 1. Infection 2. Trauma to urethra
89
90 Cystography
91 Retrograde Cystography
92 Cystography: Indication 1. Evaluate size and contour of urinary bladder 2. Bladder carcinoma 3. Trauma: rupture bladder 4. Low-pressure vesicoureteral reflux 5. Vesical fistula
93
94 Voiding Cystourethrography (VCUG)
95 Voiding Cystourethrography (VCUG)
96
97 VCUG: Indication 1. Urinary tract infection in children: - Urethral abnormality: posterior urethral valve - Vesicoureteral reflux (VUR) 2. Cause of urinary incontinence
98 Urethrography 1. Descending (antegrade) urethrography 2. Ascending (retrograde) urethrography
99 Descending Urethrography Urethrography was performed during voiding
100 Ascending/Retrograde Urethrography
101 Urethral stricture at bulbous portion
102 Urethrograpy: Indication 1. Urethral trauma 2. Urethral stricture or anomaly
103 Ultrasonography (US)
104
105 1. Liver 2. Right kidney 3. Right diaphragm 4. Hepatorenal pouch Longitudinal scan of right kidney
106 Normal kidney Liver parenchyma Normal renal parenchyma, slightly hypoechoic Hepatorenal pouch, no free fluid Normal renal fat = hyperechoic No dilatation of collecting system
107 Normal renal pyramids: medulla triangular-shaped, hypoechoic structures
108 Renal parenchymal disease Normal kidney Increased renal echogenicity
109 Obstruction hydronephrosis Renal parenchyma, hypoechoic Dilated collecting system, anechoic (fluid) Compressed renal fat, hyperechoic
110 Renal mass: solid / cystic
111 Bladder, uterus, prostate gland
112 US: Indication 1. Renal mass 2. Creatinine rising Renal disease or obstruction 3. Infection of kidney Renal abscess, perinephric abscess 4. Renal transplant patients 5. Urinary bladder lesion 6. Renal biopsy
113 US-KUB 1. No radiation 2. Can be used in pts with renal failure 3. No need to NPO 4. Image guided biopsy 1. Cannot evaluate renal function 2. Limit evaluation of ureter 3. Operator dependent
114 Computed Tomography (CT KUB)
115
116 CT Renal Protocol I. Precontrast phase II. Corticomedullary phase (30-60 sec) III. Nephrographic phase ( sec) IV. Excretory or delayed phase ( sec)
117 Non contrast
118 Corticomedullary phase
119 Nephrographic phase
120 Excretory phase
121 Ureter
122 Ureter
123 Ureter
124 Ureter
125 Ureter
126 Ureter
127 Bladder
128 CT: Indication 1. Renal mass: diagnosis, staging 2. Tumor of urinary system 3. Renal trauma 4. Infection 5. Renal artery stenosis 6. Renal stone protocol
129 CT KUB 1. Can evaluate renal function and anatomy 2. Good detail study 1. Radiation 2. Contrast administration
130 Magnetic Resonance Imaging (MRI)
131 Magnetic Resonance Imaging (MRI)
132 MRI 1. No radiation 2. Risk of Gadolinium allergy < iodinated CM 3. Good for evaluating renal artery stenosis 1. Long scan time 2. Metallic / motion artifact 3. Not sensitive for stone or calcification 4. Expensive
133 Renal Angiography
134 Renal Angiography
135 Renogram
136 Renogram
137 Summary Normal radiographic anatomy Kidney, Ureter, Bladder, urethra Investigation of the KUB system Indication Contraindication Complication Interpretation
138
139 Thank You
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