2. Definition
CT examination of the entire urinary tract before and after the
administration of IV contrast material and includes excretory
phase images.
CT IVP - ANATOMICAL AND FUNCTIONAL INFORMATION.
CT KUB - ANATOMICAL
4. BASIC CONCEPT OF URINARY TRACT
IMAGING
IMAGING MUST INCLUDE…
(a) UNENHANCED AXIAL CT OF THE KIDNEYS,
(b) ENHANCED CT OF THE ABDOMEN AND PELVIS
(c)EXCRETORY PHASE ENHANCED IMAGES OF THE URINARY TRACT
5. UNENHANCED CT SCANS USED FOR EVALUATION OF…
• STONE DISEASE
• RENAL PARENCHYMAL CALCIFICATIONS
• PRECONTRAST ATTENUATION MEASUREMENTS OF RENAL MASSES
• EXCLUSION OF HEMORRHAGIC CHANGES.
6. CONTRAST MATERIAL–ENHANCED IMAGING, ESSENTIAL FOR
COMPLETE EVALUATION OF THE URINARY TRACTS.
Nephrographic phase EVALUATION OF RENAL PARENCHYMA
(INFLAMMATION , SCARRING , TUMOURS )
CORTICOMEDULLARY DIFFERENTIATION – 30-70 SECONDS AFTER
CONTRAST
LOOK FOR RENAL VASCULATURE AND PERFUSION
LESS SENSITIVE FOR MEDULLARY MASS
HOMOGENEOUS NEPHROGRAPHIC ENHANCED PHASE - 90– 180
SECONDS
MORE SENSITIVE FOR DETECTION AND CHARACTERIZATION OF ALL
RENAL MASSES.
7. EXCRETORY PHASE- 8–10 MINUTES AFTER CONTRAST
EVALUATION OF SUBTLE UROTHELIAL ABNORMALITIES INCLUDING
UROTHELIAL TUMORS
• PAPILLARY NECROSIS
• CALICEAL DEFORMITY
• URETERAL STRICTURE
• INFLAMMATORY CHANGES OF THE RENAL COLLECTING SYSTEMS,
URETERS, AND BLADDER.
THE BLADDER IS SEEN BEST ON 20- MINUTE AND POSTVOIDING
IMAGES.
9. THREE PHASE PROTOCOL
UNENHANCED PHASE
NEPHROGRAPHIC PHASE AFTER 90-100 SECS
PYELOGRAPHIC PHASE AFTER 12-15 MINUTES
4 PHASE PROTOCOL (5 MIN AND 7.5 MIN)
10. SPLIT BOLUS PROTOCOL
UNENHANCED PHASE
NEPHRO-PYELOGRAPHIC PHASE : 30 ML OF NONIONIC
CONTRAST MATERIAL IS INFUSED AND AFTER 10 MIN
ANOTHER 100 ML OF CONTRAST IS INJECTED
ADV: ASSESS TRACT WITH LOW RADIATION EXPOSURE.
11. SUPPLEMENTAL USE OF NORMAL SALINE
INFUSION AND DIURETIC INJECTION.
1. SUPPLEMENTAL INFUSION OF 250 ML OF PHYSIOLOGIC SALINE
IMMEDIATELY AFTER INJECTING INTRAVENOUS CONTRAST
MATERIAL SIGNIFICANTLY IMPROVES OPACIFICATION OF THE
DISTAL URINARU TRACT.
2. LOW-DOSE DIURETICS (10 MG OF FUROSEMIDE)
12. The 7.5-minute delayed excretory phase enhanced CT acquisition
technique resulted in the most significantly increased distention of the
intrarenal collecting system and proximal ureter, followed by the saline
infusion technique.
16. NORMAL PAPILLARY BLUSH
Backflow into terminal
collecting ducts (papillary
ducts); Produces wedge-
shaped striated area or
blush extending from a
calyx; Usually considered
normal phenomenon.
18. PTOTIC KIDNEY
Nephroptosis (also called
floating kidney or renal ptosis) is an
abnormal condition in which
the kidney drops down into the pelvis
when the patient stands up. It is more
common in women than in men.
22. DOUPLEX LEFT COLLECTING SYSTEM WITH
ECTOPIC UPPER MOIETY URETER
TheWeigert-Meyer rule states that. the
upper pole ureter is the ectopic ureter
and its orifice inserts inferomedially in the
bladder in relationship to the lower pole
normal ureter.
23.
24. BENIGN TUBULAR ECTASIA
The appearance arises from congenital dilatation/ectasia of the distal tubules
of the nephrons in a medullary pyramid.
25. CTU shows a "paintbrush" appearance to the medullary pyramid.
(tubules dilated to ~0.2 mm).
Unlike medullary nephrocalcinosis renal tubular ectasia cannot be seen
ON noncontrast CT.
26. CROSSED FUSED ECTOPIA
Crossed fused renal ectopia essentially refers to an anomaly where the
kidneys are fused and located on the same side of the midline.
Subtypes
type a: inferior crossed fusion
type b: sigmoid kidney
type c: lump kidney
type d: disc kidney
type e: L-shaped kidney
type f: superiorly crossed fused
37. Renal medullary nephrocalcinosis is the commonest form of nephrocalcinosis and
refers to the deposition of calcium salts in the medulla of the kidney.
51. CASE (1)
PREAND POST CONTRAST MIPIMAGES
TUBULAR DILATATION WITH TINY
CALCULI WITHIN THE DILATED TUBULES
(MEDULLARY SPONGE KIDNEY)
52. Renal papillary necrosis refers to ischemic necrosis of the renal papillae.
CT IVP typically demonstrates multiple small collections of contrast
material in the papillary regions peripheral to the calyces. The entire papilla
may become necrotic. The papillary defects may eventually become
peripherally calcified.
60. FIBROV
ASCULAR POLYPOFTHE URETER
Fibroepithelial polyp is a benign
mesodermal tumor mainly seen in adults.
Radiologically, the diagnosis is very hard
to make.
Excision is advised if
hydroureteronephrosis is seen or if the
patient is symptomatic since there is an
overlap in appearance with
transitional/urothelial cell carcinoma.
62. Transitional cell carcinoma (TCC) is the most common primary neoplasm
of the urinary bladder, and bladder TCC is the most common tumour of
the entire urinary system.
Bladder transitional cell carcinomas appear as either focal regions of
thickening of the bladder wall, or as masses protruding into the bladder
lumen, or in advanced cases, extending into adjacent tissues.