Kumaresan M, Sangeetha A, Vijayakumar J, Francis Y. M, Siva T, Balaji K. Analysis of Intra Renal Arterial Pattern in Kidney Donors using 64-Slice Computed Tomography Angiography. Biomed Pharmacol J 2019;12(1).

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Manuscript received on :05-Jan-2019
Manuscript accepted on :06-Mar-2019
Published online on: 15-03-2019

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Kumaresan M*¹, Sangeetha A², Vijayakumar J¹, Yuvaraj Maria Francis¹, Siva T³ and Balaji K¹

¹Department of Anatomy, Saveetha Medical College Hospital, Thandalam, Chennai India.

²Department of Physiology, Saveetha Medical College Hospital, Thandalam, Chennai India.

³Department of Anatomy, Sri Ramachandra Medical College and research institute, Chennai, India.

Corresponding Author E-mail: kumaresan1204@gmail.com

DOI : https://dx.doi.org/10.13005/bpj/1657

Abstract

The renal artery when it reaches close to the hilum of kidney where it cleaves into anterior and posterior divisions were receives around 75% and 25% of blood respectively. Further these branches divide into many segmental branches. These segmental arteries does not have collateral system, so when there is any occlusion of these arteries which results in the ischemia of the particular segment of kidney. Anatomists believe that knowledge of presence of lower polar artery is essential for polar nephrectomy. Prior knowledge of variations in the renal vessels is required for urological surgery for preoperative investigations as there are reports of surgical complications which include enormus haemorrhage. In this study we analyzed the different variations in the intra renal branch of inferior segmental artery.

Keywords

CT Angiogram; Inferior Segmental Artery; Kidney Donors; Nephrectomy; Renal Artery

Introduction

The renal artery is one of the lateral branches of abdominal aorta, as it reaches closer to the kidney it splits into anterior and posterior division were it receives around 75% and 25% of blood respectively. Further these branches divide into many segmental branches. These segmental arteries does not have collateral system, so when there is any occlusion of these arteries which results in the ischemia of the particular segment of kidney.¹If lower polar accessory renal artery is present in the infant, it should be noted to be in close relation to main renal artery and not to ureter.

In later part of life the poles of kidney are separated from the main artery in such a case it could obstruct the ureter.² Interestingly, a recent study result tells the reality about the galactosemia patients should be monitored for anomalies of renal vessels.³ Anatomists believe that precise knowledge of presence of lower polar artery is essential for polar nephrectomy. Prior awareness of anomalous of renal artery is needed for the urologist in preoperative findings as there are reports surgical complications which enormous haemorrhage.⁴ There are very less reports of additional renal artery to poles of kidney. Arrival of renal artery into the kidney other than usual route is considered as infrequent findings.⁵ The entire accessibility rate for inferior segmental artery rate was 88.5% from an anterior and 66.7% from a posterior surgical approach.^6,7,8 This present study is to analyze the intra renal arterial pattern of inferior segmental artery in kidney donors. This study results not only gives information to intra-renal surgeries but also for renal transplantation.

Materials and Methods

In this study 99 CT angiogram images were analyzed in work station of specialized scan centre in Chennai after getting approval from the Institutional Human Ethics Committee, Saveetha Medical College – IHEC No. 001/09/2015/IEC/SU.The CT machine used was light speed VCTXTe, ADW 4.5 Version, 64 slice Computed Tomography Angiography. The study group was drawn from kidney donors who approached the scan center had no diseases related to kidney. Out of 99 donors there were 54male, and 45 were female. Inferior segmental branch of renal artery is classified into four types depending upon the mode of its origin [kher et al]. They are 

Type I

Inferior segmental branch arises from the anterior division of renal artery.

Type II

Inferior segmental branch arises from the posterior division of renal artery.

Type III

Inferior segmental branch emerges from the main renal artery.

Type IV

Inferior segmental branch arises either above or below the main renal artery from aorta.

Observation and Results

Percentage of occurrence of pattern of origin of inferior segmental artery is given below. Among the 99 donors (198 kidneys), type 1 is seen in 66 kidneys on both sides, type 2 is seen in 6 kidneys on right side and 3 on left side, type 3 is seen around in 11 kidneys on right and 12 on left, type 4 is seen in 12 kidneys on right side and 13 on left side. Other patterns are seen in 4 kidneys on right and 5 on left side. In few kidneys we found an inferior segmental artery emerges from common iliac and middle segmental branch of renal artery.

Graph 1: Showing the distribution of inferior segmental artery.   Click here to view graph

There is no association between the pattern of inferior segmental branch between right and left side, χ2 = 1.195; P = 0.879.

Discussion

This present work reported that the inferior segmental artery type 1 arises from anterior division of renal artery found to be more frequent which is similar to previous studies by servo et al⁹ reported in 47% of cases, Raghavendra et al¹⁰ reported in 51.66%, Chandra Girish et al¹¹ reported in 59% of cases and Fine H et al¹² study not observed the type 1 inferior segmental artery. Results obtained in our study shows different percentage in compare to other results (Table 2).

Table 1

Values given in parenthesis are percentage. Statistical values are given in the below chart.

Table 2: Comparison of inferior segmental branch with previous workers.

And this is the only angiographic study to find out the variations in inferior branch of renal artery in live donors, so compare to the previous study the results shows great significance. We also compared not only the variations in the sides but we found the gender differences. In this current study, type I and type II are more frequent in male on both sides whereas Type III and IV are more frequent in female on both sides. There is no association within the pattern of inferior segmental branch of renal artery between right and left side c2 = 1.195; P = 0.879. The presence of accessory lower polar artery prevail as the kidneys ascend upwards they are nourished by a succession of momentary aortic sprouts that emerge at gradually higher levels. Such arteries will not elongate to follow the ascending kidney but instead dissipated and are replaced by recent arteries. The final pair of arteries forms in the lumbar region and becomes the definitive renal arteries. Rarely, a inferior pair of arteries persistent as additional inferior polar arteries. Additional renal arteries can emerge from the abdominal aorta aloft the main branch or as low (inferiorly) as the internal iliac artery.¹³ Diverse origins may be from ventral branches of abdominal aorta such as, celiac, superior and inferior mesenteric and also from middle colic, lumbar, middle sacral and opposite side renal arteries have been reported.¹⁴

Figure 1: Showing the classification of Inferior Segmental artery depending upon its origin.   Click here to view figure

Figure 2: Showing the origin of inferior segmental artery from common iliac artery.   Click here to view figure

The presence of such anomalies may be important from the academic, anthropological and radiological point of view.¹⁵

Conclusion

The precise knowledge of intra renal arterial branches will provide a informative benefaction for surgeons in performing more conservative renal surgeries like partial and segmental resection of renal tissue instead of going for comprehensive nephrectomy.

Acknowledgements

I thank the Department of Anatomy, Saveetha Medical College and Hospital.

Conflict of Interest

There is no conflict of interest.

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