Table 1.
Clinical characteristics (N = 21).
Table 2.
Renal ultrasonography in clinically suspected UTI (N = 42).
Table 3.
Comparison of ultrasound images and DMSA scan results (N = 10)*.
Fig 1.
Febrile urinary tract infection in a 20-month-old boy (patient no.
1). (A) The grayscale ultrasound examination revealed increased cortical echotexture but no demonstrable focal lesion in the right kidney. (B) The hypoperfusion area at the lower polar area, which was seen on contrast-enhanced ultrasound (CEUS), was missed by color Doppler ultrasound (CDUS) (arrow). (C) CEUS showed definite hypoperfusion area (arrows) in the right kidney lower pole in the cortical phase (left) and early parenchymal stage (right). (D, E) The left kidney also showed increased cortical echotexture and focal hypoperfusion area (arrows) at the upper pole on CDUS. (F) CEUS showed multifocal hypoperfusion area (arrows) in the left kidney in the early parenchymal phase (left) and late parenchymal stage (right). (G) After two days, 99mTc‒dimercaptosuccinic acid scan revealed multifocal cortical defects.
Fig 2.
Febrile urinary tract infection in a 2-month-old boy (patient no.
7). (A) The grayscale ultrasound examination revealed no abnormalities in the right kidney. (B) The hypoperfusion area at the mid and lower polar area, which were seen on contrast-enhanced ultrasound (CEUS), was missed by color Doppler ultrasound (CDUS) (arrow). (C, D) CEUS showed no perfusion decrease in the right kidney in the cortical phase (C) but showed multifocal lesions in the late parenchymal stage (D). (E) After six days, 99mTc‒dimercaptosuccinic acid scan revealed multifocal cortical defect.
Fig 3.
Febrile urinary tract infection in a 38-month-old girl (patient no.
20). (A) The grayscale ultrasound examination revealed no abnormalities in the left kidney. (B) Color Doppler ultrasound examination also did not reveal the focal perfusion abnormality. (C) CEUS showed no hypoperfusion area in the left kidney in the early parenchymal phase but showed a suspicious decreased renal enhancement, and (D) showed multifocal lesions in the late parenchymal stage. (E) After three days, 99mTc‒dimercaptosuccinic acid scan revealed multifocal cortical defects in the left kidney.
Table 4.
Test results of the 5 patients who underwent DMSA scan.