Renal Development and Congenital Anomalies
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1
What does the ureteric bud develop into?
Ureter, renal pelvis, calyces, and collecting ducts.
2
What does metanephric tissue develop into?
Nephrons.
3
What process forms nephrons?
Reciprocal developmental induction.
4
What developmental abnormalities cause key renal anomalies?
Abnormal ascent, fusion, or budding.
5
What is the first-line imaging modality for congenital renal anomalies?
Ultrasound.
6
What does ultrasound evaluate in congenital renal anomalies?
Kidney location, renal tissue, collecting systems, and bladder.
7
What imaging study evaluates vesicoureteral reflux and valves?
VCUG.
8
What imaging study evaluates urinary drainage?
MAG3.
9
What imaging study evaluates the renal cortex?
DMSA.
10
What imaging study evaluates complex ureters?
MRU.
11
What imaging study is used in selected complex cases or stones?
CTU.
12
What is renal agenesis?
Complete absence of a kidney due to failure of renal development.
13
What is the incidence of renal agenesis?
~1 in 1,000–2,000 births.
14
What causes renal agenesis?
Failure of ureteric bud formation or interaction with metanephric tissue.
15
How does unilateral renal agenesis commonly present?
Often asymptomatic or incidentally detected.
16
What may develop in a patient with a solitary functioning kidney?
Hypertension or proteinuria.
17
What anomalies may be associated with renal agenesis?
Reproductive anomalies.
18
What is the expected life expectancy in unilateral renal agenesis?
Normal life expectancy.
19
What syndrome is classically associated with bilateral renal agenesis?
Potter syndrome.
20
What is the outcome of bilateral renal agenesis?
Fatal.
21
What is the first imaging test to confirm suspected renal agenesis?
Renal and bladder ultrasound.
22
What imaging finding characterizes renal agenesis?
Empty renal fossa with absence of the kidney after ectopia is excluded.
23
What compensatory change may occur in the opposite kidney in renal agenesis?
Contralateral compensatory hypertrophy.
24
What does Doppler help confirm in suspected renal agenesis?
Absence of renal vessels on the affected side.
25
When are MRI or CT used in suspected renal agenesis?
When ectopia remains uncertain.
26
When is DMSA used in suspected renal agenesis?
When the presence of functioning renal tissue remains uncertain.
27
What is the lying-down adrenal sign?
Flattened adrenal appearance in the empty renal fossa.
28
What is the normal adrenal appearance described in the lecture?
A Y-shaped configuration.
29
What is renal hypoplasia?
A small, normally formed kidney.
30
What is the incidence of renal hypoplasia?
Variable, with no reliable single population estimate.
31
What causes renal hypoplasia?
Reduced nephron formation.
32
What is the renal parenchyma like in renal hypoplasia?
Essentially normal.
33
How does renal hypoplasia commonly present?
As an incidentally detected small kidney.
34
Why can renal hypoplasia predispose to urolithiasis?
Reduced urine volume can cause urinary stasis.
35
What infections may be more common in renal hypoplasia?
Urinary tract infections.
36
What imaging test assesses renal length and cortex in hypoplasia?
Renal ultrasound.
37
What study can assess functioning cortex in renal hypoplasia?
DMSA.
38
What is the classic ultrasound appearance of renal hypoplasia?
A uniformly small kidney with preserved morphology and normal parenchyma.
39
What is renal dysplasia?
Abnormal differentiation of renal tissue.
40
How common is renal dysplasia compared with renal hypoplasia?
More common.
41
What is the incidence of renal dysplasia stated in the lecture?
3 per 1,000 births.
42
Which sex is more frequently affected by renal dysplasia?
Males, 30–90% more frequently than females.
43
How may renal dysplasia present clinically?
Incidentally, antenatally, or with hypertension, UTIs, or chronic kidney disease.
44
What is bilateral renal dysplasia associated with?
End-stage renal disease.
45
What is the first-line imaging modality for renal dysplasia in children?
Renal ultrasound.
46
Why is VCUG often obtained in renal dysplasia?
To evaluate for associated vesicoureteral reflux.
47
What are possible ultrasound findings in renal dysplasia?
Cystic areas, echogenic parenchyma, small kidneys, or hydronephrosis with thin parenchyma.
48
What is the most common form of cystic renal disease in infants and children?
Multicystic dysplastic kidney (MCDK).
49
What is the incidence of MCDK?
1 in 2,500–4,000.
50
Which kidney is more commonly affected by MCDK?
Left kidney.
51
What is the proposed cause of MCDK in the lecture?
Early severe in-utero obstruction.
52
What happens to the affected kidney in MCDK?
It is replaced by multiple cysts and has no functioning renal tissue.
53
What are the two main types of MCDK?
Pelvi-infundibular and hydronephrotic-obstructive.
54
Which type of MCDK is most common?
Pelvi-infundibular.
55
What characterizes pelvi-infundibular MCDK?
Multiple small noncommunicating renal cysts associated with atresia of the ureter and renal pelvis.
56
What is the possible kidney size in pelvi-infundibular MCDK?
Small, normal-sized, or enlarged.
57
What characterizes hydronephrotic-obstructive MCDK?
A dominant cyst in the renal pelvis.
58
When is MCDK commonly diagnosed?
Antenatally or during the early neonatal period.
59
What is the first-line imaging test for MCDK?
Ultrasound.
60
What imaging may be used if MCDK is not recognized on ultrasound?
CT or MRI.
61
What are the classic imaging findings of MCDK?
Multiple variably sized noncommunicating cysts with no normal central collecting system or functional parenchyma.
62
How early can antenatal ultrasound detect MCDK?
As early as the 15th week of gestation.
63
How can the appearance of MCDK change over time?
It may involute completely or become a large multicystic mass.
64
What is the most common contralateral renal tract abnormality associated with MCDK?
Vesicoureteric reflux.
65
What percentage of MCDK cases may have contralateral vesicoureteric reflux?
Up to 20%.
66
What is the bunch-of-grapes appearance?
Multiple noncommunicating cysts of different sizes replacing renal tissue.
67
Why is MCDK described as having a bunch-of-grapes appearance?
The clustered, round, fluid-filled cysts resemble a bunch of grapes.
68
Are the cysts in MCDK dilated communicating calyces?
No, they are dysplastic cysts.
69
What imaging features help distinguish MCDK from severe hydronephrosis?
Absent normal renal sinus and scant functional cortex.
70
What does the bunch-of-grapes appearance represent?
A descriptive appearance, not a specific diagnostic sign.
71
What does ARPKD stand for?
Autosomal recessive polycystic kidney disease.
72
What is the incidence of ARPKD?
~1 in 20,000 live births.
73
Which gene is mutated in ARPKD?
PKHD1.
74
On which chromosome is the PKHD1 gene located?
Chromosome 6p.
75
What renal structures are affected in ARPKD?
Distal convoluted tubules and collecting ducts.
76
What type of renal disease occurs in ARPKD?
Bilateral symmetric microcystic disease.
77
What determines the age of presentation in ARPKD?
The number of ducts involved.
78
What imaging studies are used for ARPKD?
Prenatal or postnatal renal ultrasound and hepatic ultrasound.
79
When is MRI used in ARPKD?
Selectively for complications.
80
What are the classic renal ultrasound findings in ARPKD?
Bilateral enlarged echogenic kidneys with reduced corticomedullary differentiation and multiple small cysts.
81
What hepatic findings may occur in ARPKD?
Coarse echotexture, biliary tract cystic changes, and portal hypertension.
82
Why may tiny cysts in ARPKD not be visible on ultrasound?
They may be below ultrasound resolution.
83
What is the salt-and-pepper appearance in ARPKD?
A finely bright, granular appearance of the enlarged echogenic kidneys.
84
What causes the granular ultrasound appearance in ARPKD?
Numerous microscopic interfaces scatter the ultrasound beam.
85
What is the anatomic basis of ARPKD?
Fusiform dilatation of collecting ducts.
86
Are macrocysts commonly apparent in infancy with ARPKD?
No, they are often not apparent.
87
Is the salt-and-pepper pattern diagnostic of ARPKD by itself?
No, it requires clinical or genetic correlation.
88
What may CT show in ARPKD?
Enlarged kidneys and associated liver changes, such as congenital hepatic fibrosis.
89
Is CT the first-line imaging modality for ARPKD?
No.
90
What is an ectopic kidney?
A kidney that fails to reach its normal retroperitoneal location because of arrested migration.
91
What is the incidence of one normal kidney with one pelvic kidney?
1 in 3,000.
92
What is the incidence of crossed renal ectopia stated in the lecture?
1 in 7,000.
93
What is the incidence of ectopic thoracic kidney?
1 in 13,000.
94
What is the incidence of solitary pelvic kidney?
1 in 22,000.
95
How do ectopic kidneys commonly present?
They are usually asymptomatic.
96
What symptoms may occur when an ectopic kidney develops infection or calculi?
Non-classical abdominal pain.
97
Why are ectopic kidneys prone to traumatic injury?
They may be located in the lower abdomen, pelvis, or thorax.
98
What causes an ectopic kidney?
Arrested cephalic migration during embryologic development.
99
What happens to renal vessels during normal kidney ascent?
Temporary aortoiliac branches degenerate as the kidney reaches its normal location.
100
What happens to renal vessels when kidney ascent is arrested?
The ectopic kidney may retain older aortoiliac vessels.
101
What are the classic findings of an ectopic kidney?
Empty normal renal fossa, pelvic kidney, shortened ureter, and often abnormal hilar rotation.
102
What is the ultrasound finding in an ectopic kidney?
The expected renal fossa is empty, with renal tissue identified in the pelvis or lower abdomen.
103
What vascular finding may Doppler show in an ectopic kidney?
Aberrant vascular supply and often anomalous hilar orientation.
104
What can IVU confirm in an ectopic kidney?
The ectopic position.
105
Where was the ectopic left kidney with axial rotation described in the lecture?
Adjacent to the L5 and S1 vertebral bodies.
106
What can CT or MRI demonstrate in an ectopic kidney?
Ectopic position, malrotation, arterial anatomy, and drainage.
107
What is the most common type of renal fusion anomaly?
Horseshoe kidney.
108
What is the incidence of horseshoe kidney?
~1 in 400–500 births.
109
How do patients with horseshoe kidney commonly present?
Usually asymptomatic and identified incidentally.
110
Why can horseshoe kidney become symptomatic?
Poor drainage can lead to complications.
111
What obstruction is associated with horseshoe kidney?
Pelviureteric junction obstruction.
112
What is a common complication of horseshoe kidney?
Hydronephrosis.
113
What percentage of horseshoe kidney patients may develop renal calculi?
Up to 60%.
114
What other complications are associated with horseshoe kidney?
Trauma, infection, pyeloureteritis cystica, malignancy, renal carcinoid, and renovascular hypertension.
115
What malignancies are associated with horseshoe kidney in the lecture?
Wilms tumor and urothelial carcinoma of the renal pelvis.
116
What rare tumor is associated with horseshoe kidney?
Renal carcinoid.
117
What is the anatomic basis of horseshoe kidney?
Fusion across the midline of two distinct functioning kidneys.
118
What structure connects the two kidneys in horseshoe kidney?
An isthmus of functioning renal parenchyma or fibrous tissue.
119
Which poles are most commonly fused in horseshoe kidney?
Lower poles, in 90% of cases.
120
What fusion pattern occurs in the remaining 10% of horseshoe kidney cases?
Fusion of superior poles or both superior and inferior poles.
121
What is the name for horseshoe kidney with both superior and inferior pole fusion?
Sigmoid kidney.
122
Which artery restricts the ascent of a horseshoe kidney?
Inferior mesenteric artery.
123
How does the inferior mesenteric artery restrict horseshoe kidney ascent?
It hooks over the isthmus.
124
What is the position of a horseshoe kidney?
Low-lying.
125
Which direction do the inferior poles point in horseshoe kidney?
Medially.
126
How is the renal axis altered in horseshoe kidney?
The inferior poles point medially, reversing the normal renal axis.
127
Where do the ureters pass in horseshoe kidney?
Anterior to the isthmus.
128
Where is the isthmus typically located in horseshoe kidney?
Immediately below the inferior mesenteric artery.
129
What vascular feature is common in horseshoe kidney?
Associated vascular anomalies.
130
What are the classic findings of horseshoe kidney?
Fused lower poles across the midline, low kidneys, abnormal axes, and an isthmus anterior to the spine.
131
What may IVU show in horseshoe kidney?
Medially directed lower-pole calyces and abnormal long-axis orientation.
132
What may ultrasound show in horseshoe kidney?
Low-lying kidneys with medial lower-pole tissue crossing the midline.
133
Why may the isthmus be difficult to see on ultrasound in horseshoe kidney?
Bowel gas may obscure it.
134
What can IVU, ultrasound, CT, and MRU map in horseshoe kidney?
The isthmus and associated vessels.
135
What is crossed fused renal ectopia (CFRE)?
An anomaly in which the kidneys are fused and located on the same side of the midline.
136
What is the incidence of CFRE?
~1 in 1,000 births.
137
What is the male-to-female ratio in CFRE?
2:1.
138
What percentage of crossed renal ectopia cases result in fusion?
More than 90%.
139
When does CFRE develop during fetal life?
During the 4th–8th week.
140
What causes CFRE?
Abnormal renal ascent with fusion of the kidneys in the pelvis.
141
When is normal renal ascent to the L2 level completed?
By the end of the second month.
142
What is the umbilical artery hypothesis of CFRE?
An abnormally positioned umbilical artery impedes normal cephalic migration of the kidneys.
143
What is the ureteric bud hypothesis of CFRE?
The ureteric bud crosses to the opposite side and induces nephron formation in the contralateral metanephric blastema.
144
What is the anatomic outcome of CFRE?
A single renal mass with two collecting systems on one side of the abdomen.
145
What is required for normal extraperitoneal perirenal fascial plane formation?
Normal kidney ascent.
146
What happens to fascial development in renal ectopia or agenesis?
Fascial development fails in the flank without renal tissue.
147
What are consequences of failed fascial development in CFRE or renal agenesis?
Bowel malposition and relaxation of mesenteric supports.
148
What may IVU show in CFRE?
The ureter crossing from the ectopic kidney to its usual bladder insertion.
149
What may ultrasound show in CFRE?
Both kidneys on one side with an empty contralateral renal fossa.
150
What characteristic ultrasound feature may be seen between the fused kidneys in CFRE?
An anterior or posterior notch.
151
Why may fusion be difficult to delineate on ultrasound in CFRE?
The fusion may be difficult to visualize.
152
What can CT demonstrate in CFRE?
The fused renal anatomy.
153
What is a duplex collecting system?
Incomplete fusion of upper and lower pole moieties, producing partial or complete duplication of the collecting system.
154
What is the incidence of duplex collecting systems?
0.7–4% of the population.
155
What percentage of patients investigated for urinary tract symptoms may have a duplex collecting system?
Up to 8%.
156
How common are duplex collecting systems among congenital renal tract abnormalities?
They are among the most common.
157
What complications may occur in a duplex collecting system?
Vesicoureteric reflux, obstruction, or ureterocele.
158
How do most patients with a duplex collecting system present?
Asymptomatic and diagnosed incidentally.
159
Which patients with duplex systems are more likely to have symptoms?
Patients with completely duplicated ureters.
160
What symptoms may occur with a duplex collecting system?
Infection, reflux, or obstruction.
161
What may severe hydronephrosis in a duplex system cause?
Flank discomfort or a palpable mass.
162
What may an ectopic ureteral insertion below the external urethral sphincter cause in females?
Continuous dribbling incontinence.
163
What embryologic event causes a duplex collecting system?
Two separate ureteric buds arise from a single Wolffian duct.
164
What is the Weigert-Meyer rule?
A rule describing the characteristic ureteral insertion pattern in complete ureteral duplication.
165
Which ureter separates from the Wolffian duct earlier?
The future lower-pole ureter.
166
How does the future lower-pole ureter migrate as the urogenital sinus grows?
Superiorly and laterally.
167
What is the range of collecting-system duplication?
From duplication of the renal pelvis draining through one ureter to two separate systems draining independently.
168
Can duplex collecting systems be unilateral or bilateral?
Yes.
169
What congenital abnormality may be associated with a duplex collecting system?
Ureterocele.
170
What does IVU demonstrate in a duplex collecting system?
Both collecting systems.
171
What is the drooping lily appearance?
Inferior displacement of the functioning lower-pole collecting system on IVU.
172
What causes the drooping lily sign?
An enlarged, obstructed, poorly excreting upper moiety compresses the opacified lower moiety.
173
What is the characteristic position of the functioning lower-pole system in the drooping lily sign?
Inferiorly and laterally displaced.
174
What happens to the visible upper calyces in the drooping lily sign?
Relatively few upper calyces are visualized.
175
Why is it called the drooping lily sign?
The displaced lower moiety resembles a lily drooping on its stalk.
176
What is a differential diagnosis for the drooping lily appearance?
An upper-pole mass or cyst.
177
What may ultrasound show in a duplex collecting system?
Two renal pelves, a divided renal sinus, and an enlarged upper or lower moiety.
178
What should be checked for on ultrasound in a duplex collecting system?
Upper-pole hydronephrosis.
179
What can CT identify in a duplex collecting system?
Bifid or complete ureters and their level of insertion.
180
What can CT define in a duplex collecting system?
The obstructed moiety.
181
In complete ureteral duplication, how are the upper and lower renal moieties drained?
By separate ureters, each with its own bladder orifice.
182
Where does the upper-pole ureter insert according to the Weigert-Meyer rule?
Inferomedially.
183
Where does the lower-pole ureter insert according to the Weigert-Meyer rule?
Superolaterally.
184
What complication is the upper-moiety ureter more prone to?
Ectopic insertion, ureterocele, and obstruction.
185
What complication is the lower-moiety ureter more prone to?
Vesicoureteral reflux.
186
Who are the pathologists associated with the Weigert-Meyer rule?
Carl Weigert and Robert Meyer.
187
Does the Weigert-Meyer rule apply to every bifid collecting system?
No, it applies to complete duplication and has exceptions.
188
What is the primary purpose of KUB radiography?
Visualizing calcifications along the urinary tract.
189
What is the primary purpose of the initial scout image during IVU?
Establishing baseline anatomy and identifying calcifications.
190
When does the nephrographic phase occur during IVU according to the checkpoint?
Approximately 1–3 minutes after contrast injection.
191
What does the nephrographic phase demonstrate?
Contrast uptake in the renal parenchyma.
192
What is the purpose of delayed images during IVU?
Evaluating poor renal function, suspected obstruction, or incomplete urinary tract opacification.
193
What imaging examination evaluates vesicoureteral reflux during bladder filling and voiding?
Voiding cystourethrography (VCUG).
194
What is grade II vesicoureteral reflux?
Reflux reaching the renal pelvis and calyces without dilation.
195
What examination should be performed before catheterization when urethral injury is suspected?
Retrograde urethrography.
196
How is retrograde pyelography performed?
Contrast is injected into the ureters through a catheter during cystoscopy.
197
What is a major advantage of ultrasound in urinary tract imaging?
Real-time imaging without ionizing radiation.
198
How is post-void residual bladder volume assessed?
Measure bladder volume before and promptly after voiding.
199
What is the preferred CT technique for detecting urinary stones without contrast?
Non-contrast CT (CT KUB).
200
What measurement assesses the attenuation of a renal calculus on CT?
Hounsfield units.
201
Which renal CT phase occurs approximately 30 seconds after contrast injection?
Corticomedullary phase.
202
What is the characteristic enhancement in the corticomedullary phase?
Strong cortical enhancement with relatively hypoattenuating medulla.
203
Which CT phase is most useful for evaluating renal masses?
Nephrographic phase.
204
When does the nephrographic phase occur in the renal CT checkpoint?
Approximately 90 seconds after contrast administration.
205
What is the enhancement pattern during the nephrographic phase?
Relatively homogeneous enhancement of the cortex and medulla.
206
Which examination evaluates the renal collecting systems, ureters, and bladder for urothelial lesions?
CT urography.
207
What imaging procedure evaluates suspected bladder rupture using retrograde contrast through a urinary catheter?
CT cystography.
208
What is the most likely diagnosis when ultrasound shows an empty renal fossa and multiple noncommunicating cysts replacing renal tissue?
Multicystic dysplastic kidney.
209
What is the most likely diagnosis when a newborn has bilaterally enlarged echogenic kidneys, reduced corticomedullary differentiation, and a PKHD1 mutation?
Autosomal recessive polycystic kidney disease.
210
What imaging sign shows inferior and lateral displacement of the functioning lower-pole collecting system?
Drooping lily sign.
211
What congenital anomaly shows fused lower renal poles, low-lying kidneys, and an isthmus anterior to the spine?
Horseshoe kidney.
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