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Kiridi EK, Oriji PC, Briggs DC, Ugwoegbu JU, Okechukwu C, Adesina AD, Ubom AE, Bosrotsi PY, Addah AO, Abasi IJ. Ultrasound Measurement of Foetal Kidney Length during Healthy Pregnancy: Relationship with Gestational Age. Ethiop J Health Sci 2023; 33:97-106. [PMID: 36890924 PMCID: PMC9987282 DOI: 10.4314/ejhs.v33i1.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 10/05/2022] [Indexed: 03/10/2023] Open
Abstract
Background Foetal kidney length (FKL) measurements and comparisons to normal charts can be used to assess the development of the foetal kidneys throughout the entire course of pregnancy. This study was designed to assess FKL between 20 - 40 weeks' gestation, establish reference ranges for FKL and determine the relationship between FKL and gestational age (GA) in normal pregnancy. Methods This descriptive, cross-sectional study was conducted between March-August 2022, at the Obstetric Units and Radiology Departments of the two tertiary health facilities, one secondary facility and one radio-diagnostic facility in Bayelsa State, Southern Nigeria. Transabdominal ultrasound scan was used to evaluate the foetal kidneys. The relationship between foetal kidney dimensions and GA was explored using Pearson's correlation analysis. Linear regression analysis was done to define the relationship between GA and mean kidney length (MKL). A nomogram predicting GA from MKL was constructed. Level of significance was set at p<0.05. Results There was a very strong significant correlation between foetal renal dimensions and GA. The correlation coefficient between GA and mean FKL, width and anteroposterior diameter were 0.89 (p=0.001), 0.87 (p=0.001) and 0.82 (p=0.001), respectively. A unit change in mean FKL corresponded to a 79% change in GA (ɼ2), showing a very strong association between mean FKL and GA. The regression equation: GA = 9.87 + 5.91 x MKL, was derived for estimation of GA for a given MKL. Conclusions Our study revealed a significant relationship between FKL and GA. The FKL can therefore be reliably used to estimate GA.
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Affiliation(s)
- Enefia K Kiridi
- Department of Radiology, Niger Delta University Teaching Hospital, Okolobiri, Nigeria.,Silhouette Radiodiagnostic Consultants, Yenagoa, Bayelsa State, Nigeria
| | - Peter C Oriji
- Department of Obstetrics and Gynaecology, Federal Medical Centre, Yenagoa, Nigeria
| | - Datonye C Briggs
- Department of Paediatrics and Child Health, Rivers State University Teaching Hospital, Port Harcourt, Nigeria
| | | | - Chioma Okechukwu
- Department of Paediatrics and Child Health, Rivers State University Teaching Hospital, Port Harcourt, Nigeria
| | - Adedotun D Adesina
- Department of Medical Services, Nigerian Law School, Yenagoa Campus, Yenagoa, Nigeria.,Oasis Public Health Consulting Ltd, Yenagoa, Nigeria
| | - Akaninyene E Ubom
- Department of Obstetrics, Gynaecology and Perinatology, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Nigeria.,International Federation of Gynaecology and Obstetrics (FIGO) Committee on Childbirth and Postpartum Haemorrhage
| | - Panebi Y Bosrotsi
- Department of Obstetrics and Gynaecology, Diete Koki Memorial Hospital, Yenagoa, Nigeria
| | - Abednigo O Addah
- Department of Obstetrics and Gynaecology, Niger Delta University Teaching Hospital, Okolobiri, Nigeria
| | - Isaac J Abasi
- Department of Obstetrics and Gynaecology, Niger Delta University Teaching Hospital, Okolobiri, Nigeria
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Favorito LA, Lobo MLP, Fernandes AV, Gallo CM, Sampaio FJB. Kidney surface development in human fetuses: study applied to radiological diagnosis. INTERNATIONAL BRAZ J UROL 2022; 48:930-936. [DOI: 10.1590/s1677-5538.ibju.2022.9977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 07/15/2022] [Indexed: 11/13/2022]
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Sonographic estimation of gestational age from 20 to 40 weeks by fetal kidney lengths' measurements among pregnant women in Portharcourt, Nigeria. BMC Med Imaging 2019; 19:72. [PMID: 31438870 PMCID: PMC6704576 DOI: 10.1186/s12880-019-0371-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 08/12/2019] [Indexed: 11/10/2022] Open
Abstract
Background Ultrasonography has become an indispensible tool in the management of obstetric patients. Accurate determination of fetal gestational age (FGA) has posed great challenge to patient management as the accuracy of traditional biometric parameters decreases with advance in gestation age. Accuracy of fetal kidney length (FKL) in the determination of FGA at third trimester has been documented in other population. This study is aimed to create baseline reference values of fetal kidney lengths in a Nigerian population as previous studies show population specific variations. Methods This prospective cross sectional study was carried out on 534 pregnant women between 20 and 40 weeks of gestation who met the inclusion criteria at Diamond Biomedical Services Ltd. A pilot study was conducted on 20 patients to determine the reproducibility and reliability of ultrasound measurement of FKL. Fetal kidney lengths were calculated as mean of three separate measurements. The 5th, 50th and 95th percentiles were calculated using least squared regression analysis. Third polynomial regression models were used to establish the relationship between right and left FKL and FGA. Results Both FKL measurements are highly reproducible with excellent correlation and agreement within and between sonographers. It correlates strongly with gestational age while the relationships between right and left kidney lengths with gestational age were established using the following regression equations: RKL = − 11.18 + 1.193 × FGA − 0.0350 × FGA2 + 0.00037 × FGA3 and LKL = − 12.57 + 1.332 × FGA − 0.0390 × FGA2 + 0.00040 × FGA3 for right and left kidneys respectively. Conclusion Nigerian population specific baseline reference values of FKLs for the estimation of FGA should be adopted rather than relying on the Caucasians values as universal patterns.
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Li J, Guandalini M, Mcinnes H, Kandasamy Y, Trnka P, Moritz K. The impact of prematurity on postnatal growth of different renal compartments. Nephrology (Carlton) 2019; 25:116-124. [DOI: 10.1111/nep.13623] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Joan Li
- Faculty of MedicineUniversity of Queensland Brisbane Queensland Australia
| | - Michael Guandalini
- Medical Imaging and Nuclear MedicineQueensland Children's Hospital Brisbane Queensland Australia
| | - Helena Mcinnes
- Department of NeonatologyTownsville Hospital University of Newcastle Douglas Queensland Australia
| | - Yogavijayan Kandasamy
- Department of NeonatologyTownsville Hospital University of Newcastle Douglas Queensland Australia
| | - Peter Trnka
- Department of Nephrology, Queensland Children's Hospital, Brisbane and School of MedicineUniversity of Queensland Brisbane Queensland Australia
| | - Karen Moritz
- Centre for Children's Health Research, and School of Biomedical ScienceUniversity of Queensland Brisbane Queensland Australia
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Brennan S, Watson D, Rudd D, Schneider M, Kandasamy Y. Evaluation of fetal kidney growth using ultrasound: A systematic review. Eur J Radiol 2017; 96:55-64. [PMID: 29103476 DOI: 10.1016/j.ejrad.2017.09.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 08/06/2017] [Accepted: 09/22/2017] [Indexed: 01/24/2023]
Abstract
PURPOSE To determine the role of ultrasound imaging in evaluating fetal kidney growth. METHODS MEDLINE, CINAHL and EMBASE databases were electronically searched for studies between 1996 and January 2017 and limited to English language. Studies were included if they reported on an ultrasound technique to assess fetal kidney growth and they were not a case report or case series. There was independent selection of studies by two reviewers in consensus with one other reviewer. Data were extracted by one reviewer in consensus with two other reviewers. RESULTS A total of 1785 articles were identified. The full text of 39 of these were assessed for eligibility for inclusion. Twenty-eight studies were then included in the review. Standard two dimensional (2D) fetal renal measurements are easy to perform, however, this review identified that most studies had some methodological limitations. The disadvantage with 2D and three dimensional (3D) fetal renal volumes are that they include the entire kidney and good reproducibility of 3D volumes has not yet been demonstrated. Currently there is limited research on fetal kidney growth in the setting of abnormal fetal growth. Research focussing directly on fetal kidney parenchyma and blood flow is scarce. CONCLUSIONS Some nomograms of 2D and 3D fetal kidney size and volume have been developed. Kidney length is the most popular single fetal kidney measurement; however, it does not seem to be a good indicator of growth. In IUGR fetuses, kidney length remained similar to appropriately grown fetuses whereas AP and TS dimensions were significantly decreased. New ultrasound techniques focusing on the parenchyma of the kidney and perfusion to the kidney should be explored as they may provide more meaningful information on kidney development in the fetus and future kidney function.
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Affiliation(s)
- Sonja Brennan
- Ultrasound Department, The Townsville Hospital, IMB 47 P.O. Box 670, Douglas, Townsville, Queensland, 4810, Australia; College of Public Health, Medical and Veterinary Sciences, James Cook University, 1 James Cook Drive, Townsville, Queensland 4811, Australia.
| | - David Watson
- Department of Obstetrics and Gynaecology, The Townsville Hospital, IMB 85 P.O. Box 670, Townsville, Queensland 4810, Australia
| | - Donna Rudd
- College of Public Health, Medical and Veterinary Sciences, James Cook University, 1 James Cook Drive, Townsville, Queensland 4811, Australia
| | - Michal Schneider
- Department of Medical Imaging and Radiation Sciences, School of Primary And Allied Health Care, 10 Chancellors Way, Monash University, Clayton, Victoria 3800, Australia
| | - Yogavijayan Kandasamy
- College of Public Health, Medical and Veterinary Sciences, James Cook University, 1 James Cook Drive, Townsville, Queensland 4811, Australia; Department of Neonatology, The Townsville Hospital, IMB 51 P.O. Box 670, Townsville, Queensland 4810, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, John Hunter Hospital, The University of Newcastle,University Drive, Callaghan, NSW 2308, Australia
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Fetal Kidneys Ultrasound Appearance in the First Trimester - Clinical Significance and Limits of Counseling. CURRENT HEALTH SCIENCES JOURNAL 2016; 42:19-30. [PMID: 30568808 PMCID: PMC6256139 DOI: 10.12865/chsj.42.01.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 03/18/2016] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The objective of this study was to determine the visualizing rate of fetal kidneys at various gestational ages in late first trimester (FT) and to establish the clinical significance of their two-dimensional ultrasound (2DUS) appearance in the FT. METHODS In a prospective cross-sectional study, 1456 women from an unselected population underwent a detailed assessment of fetal anatomy at 11+0 -13+4 weeks of gestation with the use of transabdominal sonography. Information on the ultrasound findings, antenatal course and perinatal outcome was obtained in 1331 cases. RESULTS 44 cases in which a congenital kidney disease was detected by ultrasound in the prenatal period were identified. The renal pathology was suspected in the FT in 8 cases, and confirmed by a standard test (postmortem autopsy or second-trimester scan) in 4 cases. The standard detailed second-trimester scan at 18-22 weeks diagnosed another 23 cases but refuted suspicion in 4 FT positive cases. The third trimester added another 17, all confirmed by the postpartum scan. For FT presence or absence of congenital renal anomalies, sensitivity, specificity, +LRs and -LRs of 2DUS were 9.09%, 99.69%, 29.25, and 0.91. CONCLUSION FT prenatal kidneys' visualization is critically dependent on the gestational age. FT diagnosis holds uncertainty. An early diagnosis carries a risk of providing a false-positive or a false-negative result, because the differentiation of the renal system is delayed or the diagnosis is not amenable yet to prenatal ultrasound. No FT findings can exclude the mid-trimester follow-up ultrasound scan. Second and third trimester scan are relevant for congenital kidney diseases.
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van Vuuren SH, Damen-Elias HAM, Stigter RH, van der Doef R, Goldschmeding R, de Jong TPVM, Westers P, Visser GHA, Pistorius LR. Size and volume charts of fetal kidney, renal pelvis and adrenal gland. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2012; 40:659-664. [PMID: 22581671 DOI: 10.1002/uog.11169] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/23/2012] [Indexed: 05/31/2023]
Abstract
OBJECTIVE To establish reference curves for size and volume of the fetal kidney, renal pelvis and adrenal gland, as measured using ultrasound from the 15(th) week of gestation. METHODS This was a prospective, longitudinal study of 96 fetuses in low-risk singleton pregnancies, in which we performed serial ultrasound examinations at 4-week intervals. The length and anteroposterior and transverse diameters of both kidneys, the anteroposterior and transverse diameters of the renal pelvises and the length of the adrenal glands were measured three times at each examination, with the average being used for further analysis. Reference charts were constructed using multilevel statistical analysis and comparisons were made with previously published charts derived from cross-sectional data. RESULTS We present nomograms for fetal kidney dimensions and volume, renal pelvis dimensions and adrenal gland length. The new charts show differences in shape and have narrower percentile bands in comparison to previously published reference ranges. CONCLUSIONS These new charts of measurements of the fetal kidney, renal pelvis and adrenal gland, from a prospective, longitudinal study, may be useful in the diagnosis and assessment of pathology of the kidney and adrenal gland.
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Affiliation(s)
- S H van Vuuren
- Department of Pathology, University Medical Centre Utrecht, Utrecht, The Netherlands
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Wang H, Li Q, Liu J, Mendelsohn C, Salant DJ, Lu W. Noninvasive assessment of antenatal hydronephrosis in mice reveals a critical role for Robo2 in maintaining anti-reflux mechanism. PLoS One 2011; 6:e24763. [PMID: 21949750 PMCID: PMC3176762 DOI: 10.1371/journal.pone.0024763] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 08/17/2011] [Indexed: 02/01/2023] Open
Abstract
Antenatal hydronephrosis and vesicoureteral reflux (VUR) are common renal tract birth defects. We recently showed that disruption of the Robo2 gene is associated with VUR in humans and antenatal hydronephrosis in knockout mice. However, the natural history, causal relationship and developmental origins of these clinical conditions remain largely unclear. Although the hydronephrosis phenotype in Robo2 knockout mice has been attributed to the coexistence of ureteral reflux and obstruction in the same mice, this hypothesis has not been tested experimentally. Here we used noninvasive high-resolution micro-ultrasonography and pathological analysis to follow the progression of antenatal hydronephrosis in individual Robo2-deficient mice from embryo to adulthood. We found that hydronephrosis progressed continuously after birth with no spontaneous resolution. With the use of a microbubble ultrasound contrast agent and ultrasound-guided percutaneous aspiration, we demonstrated that antenatal hydronephrosis in Robo2-deficient mice is caused by high-grade VUR resulting from a dilated and incompetent ureterovesical junction rather than ureteral obstruction. We further documented Robo2 expression around the developing ureterovesical junction and identified early dilatation of ureteral orifice structures as a potential fetal origin of antenatal hydronephrosis and VUR. Our results thus demonstrate that Robo2 is crucial for the formation of a normal ureteral orifice and for the maintenance of an effective anti-reflux mechanism. This study also establishes a reproducible genetic mouse model of progressive antenatal hydronephrosis and primary high-grade VUR.
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Affiliation(s)
- Hang Wang
- Renal Section, Department of Medicine, Boston University Medical Center, Boston, Massachusetts, United States of America
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qinggang Li
- Renal Section, Department of Medicine, Boston University Medical Center, Boston, Massachusetts, United States of America
- Department of Nephrology, PLA General Hospital, Beijing, China
| | - Juan Liu
- Renal Section, Department of Medicine, Boston University Medical Center, Boston, Massachusetts, United States of America
| | - Cathy Mendelsohn
- Department of Urology, Columbia University, New York, New York, United States of America
| | - David J. Salant
- Renal Section, Department of Medicine, Boston University Medical Center, Boston, Massachusetts, United States of America
| | - Weining Lu
- Renal Section, Department of Medicine, Boston University Medical Center, Boston, Massachusetts, United States of America
- * E-mail:
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Prenatal Diagnosis of Renal Developmental Anomalies Associated With an Empty Renal Fossa. Ultrasound Q 2010; 26:233-40. [DOI: 10.1097/ruq.0b013e3181f573fd] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sulak O, Ozgüner G, Malas MA. Size and location of the kidneys during the fetal period. Surg Radiol Anat 2010; 33:381-8. [PMID: 21110022 DOI: 10.1007/s00276-010-0749-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Accepted: 11/11/2010] [Indexed: 11/30/2022]
Abstract
PURPOSE The aim of this study was to determine the morphometric development and location of the kidneys during the fetal period. METHODS Three hundred and forty-four fetal kidneys, obtained from 172 human fetuses and aged between 9 and 40 weeks, were used in this study. Fetuses were divided into four groups according to the gestational weeks: first trimester, second trimester, third trimester, and full-term gestation. First, the anterior abdominal wall was dissected. Topographic localization of the kidneys in the abdominal cavity was then assessed. The distance between the inferior pole of the kidney and iliac crest was measured. The vertebral levels of the superior and the inferior poles and relations to ribs of the kidneys were determined. The distances between hilum of the kidneys and inferior vena cava, abdominal aorta, and midline of the vertebral column were determined. The dimensions (width, length, and thickness), weight, and volume of kidneys were measured. RESULTS The results showed that the distance between the inferior poles of the kidneys and the iliac crest increases with gestational age. The vertebral levels of the superior and inferior poles of the kidneys increased during the fetal period. The level of the left kidney was higher than the level of the right kidney in the fetal period. The posterior surface relations to the ribs showed certain ascendance during gestation, corresponding to vertebral levels. However, fetal kidneys do not reach the same level as adults at full term. The kidneys move farther apart from the midline of the body during the fetal period. The dimensions, weight, and volume of the kidneys increased with gestational age during the fetal period. The ratio between kidney weights and fetal body weights were determined, and we observed that the ratio decreased during the fetal period. There were no sex or laterality differences in any parameter. CONCLUSIONS The morphometric parameters and the location of the fetal kidneys were determined by the present study. This will also contribute to imaging of fetal kidneys and detection of kidney abnormalities in the intrauterine period. We hope that the present results can provide some useful findings for radiological (ultrasound and MR) studies.
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Affiliation(s)
- Osman Sulak
- Department of Anatomy, Faculty of Medicine, Suleyman Demirel University, Isparta, 32260, Turkey.
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Ali A, Hayder M. Ultrasonographic assessment of embryonic, fetal and placental development in Ossimi sheep. Small Rumin Res 2007. [DOI: 10.1016/j.smallrumres.2007.01.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Vlajković S, Vasović L, Daković-Bjelaković M, Cukuranović R. Age-Related Changes of the Human Fetal Kidney Size. Cells Tissues Organs 2006; 182:193-200. [PMID: 16914921 DOI: 10.1159/000093968] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2006] [Indexed: 11/19/2022] Open
Abstract
Early prenatal diagnostics and the importance of genetic counseling are of great interest for echosonographic evaluation of normal fetus anatomy. Development of the human fetal kidney runs through a series of continual and mutually dependent changes during which the kidney obtains its morphological and functional maturity. This study was created to estimate the changes in kidney size during gestation in fetuses from the 4th to the 10th lunar month, to evaluate the dynamics of their growth, as well as to establish the validity of the volume calculated from these dimensions. Serial measurements of kidney dimensions (length, width, thickness) were performed in 110 fetuses. Photomicrographs of kidneys from the 4th, 6th, 8th and 10th lunar months are also presented. On the basis of the results obtained by our examination, we concluded that the period from the 14th to 16th week of intrauterine life is the fastest period of kidney growth during fetal development. Using the ellipsoid formula for calculating the fetal renal volume offers an underestimation of about 32-33% on average. The importance of this study lies in determining the average fetal kidney dimensions, which could be used as standard values in obstetrics.
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Affiliation(s)
- Slobodan Vlajković
- Department of Anatomy, Faculty of Medicine, University of Nis, Nis, Serbia and Montenegro.
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Witzani L, Brugger PC, Hörmann M, Kasprian G, Csapone-Balassy C, Prayer D. Normal renal development investigated with fetal MRI. Eur J Radiol 2006; 57:294-302. [PMID: 16406436 DOI: 10.1016/j.ejrad.2005.11.027] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2005] [Revised: 11/14/2005] [Accepted: 11/16/2005] [Indexed: 10/25/2022]
Abstract
OBJECTIVE To evaluate age-dependent changes in fetal kidney measurements with MRI. PATIENTS AND METHODS Fetal MRI examinations were used to study the kidney length (218 fetuses), signal intensities of renal tissue, renal pelvis, and liver tissue on T2-weighted images (223 fetuses), and the whole-kidney apparent diffusion coefficient (107 fetuses). A 1.5 T superconducting unit with a phased array coil was used in patients from 16 to 39 weeks' gestation. The imaging protocol included T2-weighted single-shot fast spin-echo, T2-weighted balanced angiography and diffusion-weighted sequences. Slice thickness ranged from 3 to 5mm. RESULTS Fetal kidney length as a function of gestational age was expressed by the linear regression: kidney length (mm)=0.190 x gestational age (d) -8.034 (R(2) = 0.883, p < 0.001). Paired t-test analysis showed a highly statistically significant difference between the ratio of renal tissue signal intensity to renal pelvis signal intensity and the ratio of liver signal intensity to renal pelvis signal intensity on T2-weighted images (t = -50.963, d.f. = 162, p < 0.001), with renal tissue hyperintense to liver tissue. The apparent diffusion coefficient in relation to gestational age was described by the equation: ADC (microm(2)/s) = 0.0302 x square (gestational age (d)) -14.202 x gestational age (d) +2,728.6 (R(2) = 0.225, p < 0.001). CONCLUSION The length, signal intensity on T2-weighted images, and apparent diffusion coefficient of the fetal kidney change significantly with gestational age. The presented data may help in the prenatal diagnosis of renal anomalies.
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Affiliation(s)
- Linde Witzani
- Department of Radiology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria
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Vlajković S, Daković-Bjelaković M, Cukuranović R, Popović J. Evaluation of absolute volume of human fetal kidney's cortex and medulla during gestation. VOJNOSANIT PREGL 2005; 62:107-11. [PMID: 15787163 DOI: 10.2298/vsp0502107v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Background. Human fetal kidney is quite different from the mature kidney, both macroscopically and hystologically. Lobulated surface of the human fetal kidney reflects its inner organization. Aim. To determine the fetal kidneys' volume according to the gestational age, to establish periods of their maximal and minimal growth and to compare these values for various gestational ages. Methods. Forty five human fetal kidneys aged from IV to X lunar months were analyzed. Kidneys were divided into nine groups according to their gestational age. The volumes of cortex and medulla were determined using stereological methods. The results were statistically analyzed and the periods of significant growth of these structures were marked. Results. Fetal kidney's cortex and medulla grew continually with a very high coefficient of linear correlation with crown-rump length. The cortex/medulla ratio was minimal in the first half of V lunar month, when medulla grew most rapidly and it was maximal immediately before birth, when cortex achieved its maximum. Conclusion. This study was an effort to provide some parameters which would help in the future investigations of the development of human fetal kidney.
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Current awareness in prenatal diagnosis. Prenat Diagn 2003; 23:88-94. [PMID: 12572587 DOI: 10.1002/pd.525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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