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SUPERB MICROVASCULAR IMAGING FOR THE DETECTION OF PARENCHYMAL
PERFUSION IN UNDESCENDED TESTES IN YOUNG CHILDREN
Yong Seung LEE
1
, Myung-Joon KIM
2
, Sang Won HAN
1
, Young Jae IM
1
, Sang Woon KIM
1
, Byung Hoon JI
1
and Mi-Jung
LEE
2
1) Yonsei University College of Medicine, Department of Urology, Seoul, KOREA (REPUBLIC OF) - 2) Yonsei University
College of Medicine, Department of Radiology, Seoul, KOREA (REPUBLIC OF)
PURPOSE
Superb Microvascular Imaging (SMI) is a novel, highly sensitive technique that can detect low velocity microvascular
flow. The purpose of this study was to evaluate differences in perfusion of undescended testes (UDT) compared with
normal testes in young children using this technique.
MATERIAL AND METHODS
We prospectively performed testicular ultrasonography including Power Doppler Imaging (PDI) and SMI in young
children. Testicular size, volume, and microvascular flow for each testis were evaluated by both PDI and SMI.
Microvascular flow was categorized into four grades: grade 0, no detectable intratesticular flow; grade 1, one or two
focal areas of flow; grade 2, one linear or more than two focal areas of flow; and grade 3, more than one linear flow.
RESULTS
We imaged 40 testes from 20 boys (age, 2-29 months). Eleven boys had normal testes, seven had unilateral UDT, and
two had bilateral UDT. The mean age was younger in boys with UDT (7.8 vs. 15.9 months, p < 0.001). Testis sizes and
volumes were similar between the 29 normal and 11 UDT. However, SMI, but not PDI, detected differences in flow
grades between the groups (p < 0.001). In univariate analysis, age (odds ratio [OR], 0.829; p = 0.012) and low grade
flow on SMI (OR of grade 0, 51.886 with p < 0.001 and OR of grade 1, 14.29 with p = 0.017) were associated with UDT.
These parameters were also significant in multivariate analysis (area under the curve, 0.892).
CONCLUSIONS
This study demonstrated decreased perfusion in the UDT in young children using SMI, which can be helpful for
visualizing microcirculation and informing prognosis.