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1 Anatomy oftheKidney
run cranial and anterior to the renal pelvis when entering the hilum [15]. Due to the proximity of the aorta to the left kidney, the left renal artery is short and travels straightforwardly to its respective kidney, while the right artery is long and crosses the inferior vena cava (IVC) posteriorly before reaching its respective kidney. Inversely, due to the proximity of the inferior vena cava (IVC) to the right kidney, the right renal vein is approximately two to three times shorter than its left counter­part and travels straight to the IVC [15, 20]. The left renal vein travels anterior to the aorta below the origin of the superior mesenteric artery before entering the left side of the IVC.Rarely the left renal vein travels behind the aorta, being referred to as a retroaortic renal vein. In the very rare cases where the left renal vein duplicates, the two branches can separate and travel anterior and posterior to the aorta, forming the so-called circumaortic left renal vein. Contrary to its right counterpart, the left renal vein has many tributaries, namely the gonadal vein inferiorly, the adrenal vein superiorly, the inferior phrenic veins, the rst or second lumbar veins pos- teriorly, and paravertebral veins which are encountered in one-third of cases [15].
The renal artery divides into interlobar, arcuate, and interlobular arteries, in progressive order. With no anastomosis between them, the interlobar arteries arise from the kidney hilum and give rise to the arcuate arteries that lie at the junction between the cortex and the outer medulla. The arcuate arteries give rise to the inter­lobular arteries toward the capsule and nally to the afferent vessels of the glomeruli. Then the glomerular efferent vessels form a peritubular capillary net­work. There is a profuse peritubular vascular network surrounding the convoluted tubules.
The venous return from the medulla occurs through numerous vessels rising within and beside the vascular bundles. The hierarchy starts with the peritubular capillary venous plexus, then the venae rectae, and the arcuate veins. From this level, the venous system resembles the arterial one: the interlobular veins unite to form the renal vein anterior to the renal pelvis (Fig.1.6). However, contrary to the
arterial organization, there are anastomotic longitudinal venous arcades that communicate between the interlobular veins. Thus, these veins are not terminal,
and major branches can be surgically ligated without risking a venous obstruction. In two-thirds of the cases, there is a retrocolic vein draining a portion of the poste­rior part of the kidney [15, 16, 21, 22].
Interventional radiologists and urologists should be aware of the anatomical variations of the renal arterial supply. Roughly, the published series from various populations show a distribution of 70–82% of single arteries, 17–20% of double arteries, and 1–2% of triple arteries [14, 15, 23, 24]. After an analysis of 266 cadav­eric kidneys performed in Brazil, Sampaio, and Passos provided more details on these variations: 53.3% had one hilar artery, 14.3% had one hilar artery with one superior pole extra-hilar branch, 7.9% had two hilar arteries, 6.8% had a superior polar artery, 5.3% had an inferior polar artery, 3.4% had two hilar arteries with one superior pole extra-hilar branch, 2.6% had one hilar artery with early bifurcation,
1.9% had three hilar arteries, and other variations in 2.5% [25, 26] (Fig.1.7).
Note: The numbers in bold represent cases of single arteries for a total of 70.2%.
1.5 Arterial Supply andVenous Drainage
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Fig. 1.6 Section of the human kidney showing the major vessels that supply the blood ow to the kidney and schematic of the microcirculation of each nephron. (From Guyton and Hall [21], with permission from Elsevier)
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1 hilar artery
55.3%
2 hilar arteries
1 inferior polar
artery
with 1 superior pole extra-hilar branch
5.3% 3.4%
1 superior pole extrahilar branch
14.3%
2 hilar arteries
7.9% 6.8%
1 hilar artery with an early bifurcation
2.6%
1 superior pole artery
3 hilar arteries
1.9%
Fig. 1.7 Graphic illustration of variant renal anatomy. (From Lopez-Gonzalez etal. [26], with permission from Georg Thieme Verlag KG)
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1 Anatomy oftheKidney
It has been suggested to avoid the term “supernumerary” when referring to the accessory arteries, as no artery is superuous, each being essential for one or more segments in the kidney, and to reserve the term “aberrant” for vessels whose course is truly abnormal, for example, those entering the kidney by the poles, or whose origin is from a vessel other than the aorta, such as the hepatic artery, the superior or inferior mesenteric arteries, the right colic artery, or the lumbar arteries [11, 15].
Based on 153 kidney dissections, David Sykes proposed to divide the renal artery into three types [12]:
(a) The rst type (“the typical”) represents 83.1%. The artery is unique and divides
near or within the renal hilum into an anterior branch carrying 75% of the blood and a posterior branch carrying 25% of the blood [14]. From the two divisions arise a total of ve segmental branches, namely, the apical, upper, middle, lower, and posterior branches. These segmental arteries are end arteries and do not have collateral circulation. Hence, ligation of each of them causes irre­versible ischemia and infarction of its supplied territory [15, 16].
Unlike the apical and lower segmental arteries, the upper, middle, and poste­rior arteries are limited to the avascular Brӧdel’s line which only runs between the territories supplied by the apical and the lower segmental arteries, in a plane between the anterior 2/3 and the posterior 1/3 of the kidney, measured by recent studies to be at 2.04cm (1.8–2.4cm) medial to the lateral convex border of the kidney [27]. Based on a limited sample (only 15 kidneys), the ndings of this recent study challenge those of David Sykes, as they mention that the Brӧdel avascular plane extended from the apical to the inferior segment in six cases (40%). Anyway, it is important to know that this line is not truly avascular as there are some overlapping terminal branches of the anterior and posterior branches [11, 12, 27, 28].
(b) The second type represents 8.4%: The arterial pattern corresponds to the
venous arrangement. Here the renal artery divides into three branches: the upper, middle, and lower branches. Each of these arteries divides into an ante­rior and a posterior branch and supplies its respective third, anteriorly and posteriorly.
(c) The third type represents also 8.4%: Here there is a dual arterial pattern where
the kidney receives two arteries from the aorta, with comparable diameters.
In the abovementioned research, accessory renal arteries were encountered in
25.8%, entering the kidney cortex at one of its poles. Sampaio proposed a more practical approach that demarcates three arterial regions worthy of notice for surgi­cal trauma management or partial nephrectomy [14]:
(a) Superior pole: In 86.6% of the cases, the superior pole is supplied by three
arteries: the apical segmental artery and two other branches (i.e., anterior and posterior).
1.6 Congenital Abnormalities
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(b) Inferior pole: In 62.2% of the cases, the inferior pole is supplied only by the
inferior segmental artery, anteriorly and posteriorly, and its bleeding control
is less complicated than for the upper pole.
(c) Mid- or hilar zone: Its anatomy is very complex. Mid-kidney resection is also
technically more challenging to perform than a polar one, as it must not only control a complex vascular network but also maintain adequate vascularization and a patent collecting system for the superior and inferior poles.
13
1.6 Congenital Abnormalities
Nowadays, due to generalized antenatal ultrasonography, many abnormalities have become detectable. A German study including over 30,000 infants and fetuses showed major malformations in 6.9% and mild errors of morphogenesis in 35.9% of all infants. Among major malformations, the most frequent were musculoskele­tal, internal urogenital, and cardiovascular malformations, which collectively accounted for more than 60%, with the incidence of 239, 162, and 113 per 10,000 infants, respectively [29].
Kidney anomalies are reported to account for 20–30% of all detectable anoma­lies [30]. The congenital kidney malformations include the following phenotypes [8, 9, 30, 31] (Fig.1.8):
Horseshoe kidney (HSK) or renal fusion: This is the most frequent abnormal-
ity with an incidence of 1in every 400–500 live births.
Malrotation: The result of the malrotation is the hilum facing anteriorly, and the
incidence is 1/500.
Duplex kidney. – Polycystic kidney disease. – Multicystic dysplastic kidney (MCDK): 1in 3640 births. – Ectopic kidney: Often in pelvic location, can be unilateral or bilateral. The inci-
dence of simple ectopia is 1/10,000. Bilateral pelvic kidneys can fuse in a so-
called pancake kidney. The ectopic kidney can cross and fuse with the
contralateral one with an incidence of 1/2000. Very rarely, a three-in-one anom-
aly consisting of a solitary crossed renal ectopia has been described with only
about 35 cases reported in the literature and an estimated incidence of 1/1,500,000.
However, in all crossed kidneys, the ureters retain the embryological mem-
ory, crossing back the midline and inserting into the normal bladder site.
Renal dysplasia: Can be unilateral with an incidence of 1/4300 for multicystic
dysplastic kidneys and 1/1000 for dysplastic kidneys, or rarely bilateral with an
incidence of 1/7500.
Renal hypoplasia: Can be unilateral (1/1000) or bilateral (1/4000). – Supernumerary or accessory kidney. – Renal agenesis: Unilateral (1/1000) or bilateral (1/10,000). The latter is more
common in males and is incompatible with life.
14
Inf
ab
cd
ef
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1 Anatomy oftheKidney
erior vena cava
Aorta
Bladder
Suprarenal
Metanephric mesoderm
Absence of ureteric bud
Suprarenal gland
Bifid ureter
Complete division
of ureteric bud
gland
Double kidney
Suprarenal
gland
Pelvic kidneyPelvis
Fused kidneys
Suprarenal gland
Divided kidney
Bifid ureter
Incomplete division
of ureteric bud
Suprarenal gland
Ureters
Left kidney migrated
to right side
Discoid (”pancake”) kidney
Ureters
Fusion of kidneys
Supernumerary kidney
Two ureter ic buds
Fig. 1.8 Drawings illustrating various anomalies of the urinary system. The small sketch to the lower right of each drawing illustrates the probable embryological basis of the anomaly. (a) Unilateral renal agenesis. (b) Right side, pelvic kidney; left side, divided kidney with a bid ureter. (c) Right side, malrotation of the kidney; left side, bid ureter and supernumerary kidney. (d) Crossed renal ectopia. The left kidney crossed to the right side and fused with the right kidney. (e) Discoid (also pancake kidney) resulting from the fusion of the kidneys while they are in the pelvis. (f) Supernumerary left kidney resulting from the development of two ureteric buds. (From Zweyer M [9], with permission from Springer Nature)
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2. Eknoyan G.Michelangelo: art, anatomy, and the kidney. Kidney Int. 2000;57(3):1190–201.
https://doi.org/10.1046/j.1523- 1755.2000.00947.x.
3. Vesalius A.De Humani Corporis Fabrica. Basel: Oporinus; 1543.
4. Eustachio B.Tabulae anatomicae Bartholomaci Eustachii. Amsterdam: Wetsten; 1722.
5. Bertin M.Mémoire pour servir à l’histoire des reins. Mémoires de l’Académie Royale des Sciences; 1744.
6. Mezzogiorno A, De Santo NG, Bisaccia C, Di Iorio B, Cirillo M, Savica V, Ricciardi B, Menditti D, Richet G.Exupère-Joseph Bertin (1712-1781) and his description of the “petits siphons recourbez” (Henle’s loops, a century earlier). J Nephrol. 2013;26(Suppl. 22):93–8.
https://doi.org/10.5301/jn.5000374. Epub ahead of print.
7. Ntoulia A, Papadopoulou F, Benz-Bohm G.Urinary tract embryology, anatomy, and anatomi­cal variants. In: Riccabona M, editor. Pediatric urogenital radiology, Medical radiology. Cham: Springer; 2018. https://doi.org/10.1007/978- 3- 319- 39202- 8_7.
8. Kassab GH, etal. Urinary tract. In: Paltiel HJ, Lee EY, editors. Pediatric ultrasound. Cham: Springer; 2021. https://doi.org/10.1007/978- 3- 030- 56802- 3_17.
9. Zweyer M.Embryology of the kidney. In: Quaia E, editor. Radiological imaging of the kidney, Medical radiology. Berlin: Springer; 2010. https://doi.org/10.1007/978- 3- 540- 87597- 0_1.
10. White RD, Moore KS, Salahia MG, Thomas WR, Gordon AC, Williams IM, Wood AM, Zealley IA.Renal arteries revisited: anatomy, pathologic entities, and implications for endovascular management. Radiographics. 2021;41(3):909–28. https://doi.org/10.1148/rg.2021200162.
11. Vordermark JS 2nd. Segmental anatomy of the kidney. Urology. 1981;17(6):521–31. https://
doi.org/10.1016/0090- 4295(81)90067- 4.
12. Sykes D.The arterial supply of the human kidney with special reference to accessory renal arteries. Br J Surg. 1963;50:368.
13. Part I: Size of normal kidneys in adults. Acta Radiol. 1961;os-56(206_Suppl):7–31. https://doi.
org/10.1177/0284185161056S20602.
14. Sampaio FJ. Renal anatomy. Endourologic considerations. Urol Clin N Am. 2000;27(4):585–607, vii. https://doi.org/10.1016/s0094- 0143(05)70109- 9.
15. Klatte T, Ficarra V, Gratzke C, Kaouk J, Kutikov A, Macchi V, Mottrie A, Porpiglia F, Porter J, Rogers CG, Russo P, Thompson RH, Uzzo RG, Wood CG, Gill IS.A literature review of renal surgical anatomy and surgical strategies for partial nephrectomy. Eur Urol. 2015;68(6):980–92.
https://doi.org/10.1016/j.eururo.2015.04.010.
16. Mahadevan V. Anatomy of the kidney and ureter. Surgery (Oxford). 2019;37(7):359–64.
https://doi.org/10.1016/j.mpsur.2019.04.005.ISSN: 0263-9319.
17. Hodson J. The lobar structure of the kidney. Br J Urol. 1972;44(2):246–61. https://doi.
org/10.1111/j.1464- 410x.1972.tb10072.x.
18. Blausen.com Staff. Medical gallery of Blausen Medical 2014. WikiJournal Med. 2014;1(2)
https://doi.org/10.15347/wjm/2014.010. ISSN: 2002-4436.
19. Daly FJ, Bolender DL, Jain D, Uyeda S, Hoagland TM.Posterior approach to kidney dissection: an old surgical approach for integrated medical curricula. Anat Sci Educ. 2015;8(6):555–63.
https://doi.org/10.1002/ase.1520. Epub 2015 Feb 16.
20. Ishii H, Aboumarzouk OM, Van Poppel H.Kidney and ureter anatomy. In: Aboumarzouk OM, editor. Blandy’s urology. 3rd ed. John Wiley & Sons Ltd.; 2019. p.91–106.
21. Chap. 26: Urine formation by the kidneys: I. Glomerular ltration, renal blood ow, and their control. In: Guyton and Hall textbook of medical physiology. 12th ed. Philadelphia, PA: Elsevier; 2011. p.305.
22. Beeuwkes R 3rd. The vascular organization of the kidney. Annu Rev Physiol. 1980;42:531–42.
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23. Khamanarong K, Prachaney P, Utraravichien A, Tong-Un T, Sripaoraya K.Anatomy of renal arterial supply. Clin Anat. 2004;17:334–6. https://doi.org/10.1002/ca.10236.
24. Pradhay G, Gopidas GS, Karumathil Pullara S, Mathew G, Mathew AJ, Sukumaran TT, Pavikuttan N, Sudhakaran R Sr. Prevalence and relevance of multiple renal arter­ies: a Radioanatomical perspective. Cureus. 2021;13(10):e18957. https://doi.org/10.7759/
cureus.18957.
25. Sampaio FJ, Passos MA.Renal arteries: anatomic study for surgical and radiological practice. Surg Radiol Anat. 1992;14(2):113–7. https://doi.org/10.1007/BF01794885.
26. Lopez-Gonzalez DB, Zurkiya O. Interventional radiology in renal trauma. Semin Intervent Radiol. 2021;38(1):113–22. https://doi.org/10.1055/s- 0041- 1726006.
27. Macchi V, Picardi E, Inferrera A, Porzionato A, Crestani A, Novara G, De Caro R, Ficarra V.Anatomic and radiologic study of renal avascular plane (Brödel’s line) and its potential rel­evance on percutaneous and surgical approaches to the kidney. J Endourol. 2018;32(2):154–9.
https://doi.org/10.1089/end.2017.0689.
28. Brӧdel M. The intrinsic blood-vessels of the kidney and their signicance in nephrotomy. Johns Hopkins Hosp Bull. 1961;118:10.
29. Queisser-Luft A, Stolz G, Wiesel A, Schlaefer K, Spranger J. Malformations in newborn: results based on 30,940 infants and fetuses from the Mainz congenital birth defect monitor­ing system (1990-1998). Arch Gynecol Obstet. 2002;266(3):163–7. https://doi.org/10.1007/
s00404- 001- 0265- 4.
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31. Jain S, Chen F.Developmental pathology of congenital kidney and urinary tract anomalies. Clin Kidney J. 2019;12(3):382–99. https://doi.org/10.1093/ckj/sfy112.
1 Anatomy oftheKidney
Epidemiology ofRenal Trauma
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The kidney is the third most injured organ in abdominal trauma after the spleen and liver [1, 2] (Fig.2.1).
By the end of the last century (1997–1998), a population-based study showed an
incidence of renal trauma in the USA of 4.9 per 100,000 population, comprising
1.2% of all trauma cases [3]. However, more recent estimations based on the
American National Trauma Data Bank (NTDB) suggest a lower rate of 0.3–0.5% [4, 5]. The same proportion has been found elsewhere in Europe in general and in France in particular [6, 7]. A systematic review of 15 adult renal trauma articles including nearly 11,000 patients showed an overall male predominance of 72% and a mean age of 30.8years [8]. A more recent and larger review of 46 articles includ­ing 48,660 patients conrmed the above data showing 75.3% of males and a mean age of 33years [9], and a Japanese retrospective study conducted during the same period and including 3550 patients showed a nearly equal male predominance (74.2%) but a higher median age of 43years, which probably correlated to the age distribution in this country [10]. In the Middle East, higher male predominance and younger age of the victims might prevail in urogenital trauma (UGT) as suggested by an Iranian study that found a male rate of 91% and an average age of 25years [11].
The majority of renal injuries are caused by blunt trauma accounting for 80.5% versus only 19.5% for penetrating trauma, and the overall mortality rate is 6.4% (4.8–8.4%) [9]. However, penetrating injuries are reported to predominate in under­developed countries and areas of social insecurity and civil unrest. This fact was suggested by a retrospective study in a Turkish region subjected to increased socio­political tensions, which showed that 59% of the encountered renal injuries were secondary to gunshot wounds [12], and by a South African study that showed three­quarters of renal injuries being caused by penetrating agents and half by gunshots only [13]. In penetrating renal injuries, the median age of patients is lower (28years), and the male predominance of the victims is strikingly higher, reaching 93% [14].
When specifying UGT after road trafc accidents (RTA), the male predominance increases to 76% and the mean age remains almost the same (30.3years) [6]. When
2
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023 S. A. AL-Mamari, Urogenital Trauma: A Practical Guide,
https://doi.org/10.1007/978-981-99-6171-9_2
17
18
11%
19%
30%
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Fig. 2.1 Distribution of the four most frequent abdominal injuries in the combined data set for the years 1993–1998. (From Yoganandan N etal. [2], with permission from the Association for the Advancement of Automotive Medicine)
9%
2 Epidemiology ofRenal Trauma
31%
Spleen
Liver
Kidney
Digestive
Other
Fig. 2.2 Overall distribution of GUI after trafc accidents (n=963 victims). (From Terrier etal. [7], with permission from Wolters Kluwer Health, Inc.)
especially addressing penetrating renal trauma, the male predominance even deep­ens to 88% and the mean age falls to 28years. For the pediatric group, there is a lesser male predominance, 67%, and the mean age is 9.3years [8].
Among urogenital organs, the most frequently injured ones after motor vehicle accidents (MVA) are the kidneys and the testicles with 41–43% and 23–24%, respectively, and ureteric trauma is almost not observed [6, 7] (Fig.2.2). However, when considering only motorcyclists, 62% of injuries involved the external genita­lia, and the testes were the most injured organs (38–41%). The penis was the most
References
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19
involved organ among cyclists (23–41%), while the pedestrians showed a nearly equal frequency for all organs [6, 7].
Minor renal trauma grades are fortunately more frequently encountered than major ones, and data show the following distribution: grade I, 22–28%; grade II, 28–30%; grade III, 20–26%; grade IV, 15–19%; and grade V, 6–7%. Details of this grading will be discussed later in this section [8, 15, 16].
Notably, 85% of children sustaining renal trauma are older than 6years with a mean age of 9.3years. The distribution parallels that of the adults with the majority of blunt injuries occurring in males (67–77%) [8, 17]. However, there is a discrep­ancy with regard to the injury grade distribution in the pediatric group due to a lack of large reviews; some studies show a great proportion of high-grade injuries [8], while others present a predominance of low-grade ones [17].
References
1. Syarif, Palinrungi AM, Kholis K, etal. Renal trauma: a 5-year retrospective review in single institution. Afr J Urol. 2020;26:61. https://doi.org/10.1186/s12301- 020- 00073- 2.
2. Yoganandan N, Pintar FA, Gennarelli TA, Maltese MR.Patterns of abdominal injuries in fron­tal and side impacts. Annu Proc Assoc Adv Automot Med. 2000;44:17–36.
3. Wessells H, Suh D, Porter JR, Rivara F, MacKenzie EJ, Jurkovich GJ, Nathens AB. Renal injury and operative management in the United States: results of a population-based study. J Trauma. 2003;54(3):423–30. https://doi.org/10.1097/01.TA.0000051932.28456.F4.
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5. Ho P, Hellenthal NJ. Independent predictors of mortality for patients with traumatic renal injury. World J Urol. 2021;39:3685. https://doi.org/10.1007/s00345- 020- 03552- x. Epub ahead of print.
6. Paparel P, N’Diaye A, Laumon B, Caillot J-L, Perrin P, Rufon A.The epidemiology of trauma of the genitourinary system after trafc accidents: analysis of a register of over 43000 victims. BJU Int. 2006;97(2):338–41. https://doi.org/10.1111/j.1464- 410x.2006.05900.x.
7. Terrier JE, Paparel P, Gadegbeku B, Rufon A, Jenkins LC, N’Diaye A.Genitourinary injuries after trafc accidents: analysis of a registry of 162,690 victims. J Trauma Acute Care Surg. 2017;82(6):1087–93. https://doi.org/10.1097/TA.0000000000001448.
8. Voelzke BB, Leddy L.The epidemiology of renal trauma. Transl Androl Urol. 2014;3(2):143–9.
https://doi.org/10.3978/j.issn.2223- 4683.2014.04.11.
9. Petrone P, Perez-Calvo J, Brathwaite CEM, Islam S, Joseph DK.Traumatic kidney injuries: a systematic review and meta-analysis. Int J Surg. 2020;74:13–21. ISSN: 1743-9191. https://doi.
org/10.1016/j.ijsu.2019.12.013.
10. Nakao S, Katayama Y, Hirayama A, etal. Trends and outcomes of blunt renal trauma man­agement: a nationwide cohort study in Japan. World J Emerg Surg. 2020;15:50. https://doi.
org/10.1186/s13017- 020- 00329- w.
11. Salimi J, Nikoobakht MR, Zareei MR.Epidemiologic study of 284 patients with urogenital trauma in three trauma center in Tehran. Urol J. 2004;1(2):117–20.
12. Ersay A, Akgün Y. Experience with renal gunshot injuries in a rural setting. Urology. 1999;54(6):972–5.
13. Madiba TE, Haffejee AA, John J.Renal trauma secondary to stab, blunt and rearm injuries: a 5-year study. S Afr J Surg. 2002;40(1):5–9; discussion 9–10.