Hyperechogenicity of Renal Medulla and Urinary Bladder in Normal Neonates: Clinical Significance.
10.3348/jkrs.2000.42.1.187
- Author:
Young Tong KIM
1
;
Jai Soung PARK
;
Gun Soo HAN
;
Il Young KIM
;
Hye Kyung LEE
;
Yong Sik MIN
Author Information
1. Department of Diagnostic Radiology, Chunan Hospital, Soonchunhyang University, Korea.
- Publication Type:Original Article
- Keywords:
Neonate, US;
Kidney, US
- MeSH:
Follow-Up Studies;
Humans;
Infant, Newborn*;
Urinalysis;
Urinary Bladder*
- From:Journal of the Korean Radiological Society
2000;42(1):187-190
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To evaluate the clinical significance of hyperechogenicity of the renal medulla and urinary bladder in normal neonates. MATERIALS AND METHODS: We investigated 31 clinically normal neonates, including one post-term, 16 pre-term, and 14 full-term babies, in whom hyperechogenicity of the renal medulla or urinary bladder was seen on ini-tial sonograms. All neonates underwent sonography while aged between 1 and 21 (mean: 2.5)days. For 14, fol-low-up sonography was performed 2-20 (mean : 6.8) days later. Eighteen neonates also underwent urinalysis, and two underwent a bacteriologic examination. RESULTS: Initial sonograms revealed (hyperechogenicity in the renal medulla (n=28) and urinary bladder (n=12). Twenty-five neonates were aged less than one week, four were aged 1-2 weeks, and two were aged 2-3 weeks. Urinalysis showed that six neonates were erythrocyte-positive (+/-:1, +1:4, +4:1), two were protein-pos-itive (+/-:2), and the others were negative. In all cases the results of bacteriologic study were negative. Follow-up sonography revealed that the hyperechogencity of renal medulla had regressed (n=12) or decreased (2), and that of the urinary bladder had regressed (n=4). CONCLUSION: In clinically normal neonates, hyperechogenicity of the renal medulla and urinary bladder was mostly visualized within the first week of life, and on follow-up sonography was seen to have regressed or decreased.
