Journal of Ultrasound in Medicine, Vol 19, Issue 9 627-631, Copyright © 2000 by American Institute of Ultrasound in Medicine
Varicocele and the testicular-renal venous route: hemodynamic Doppler sonographic investigation
M. Graif, R. Hauser, A. Hirshebein, A. Botchan, A. Kessler and H. Yabetz
Department of Radiology, Tel Aviv Sourasky-Ichilov Medical Center, Israel.
The aim of this study was to quantify the anatomic and hemodynamic
components of the testicular venous drainage for the purpose of
understanding their mechanisms of interacting in producing mutual effects,
such as "nutcracker" phenomenon, reflux, and varicoceles. Seventy-five male
subjects were studied at rest and during Valsalva maneuver. Aortomesenteric
distance and angle, flow velocity in different segments of the renal veins,
testicular vein diameter, and flow inversion were evaluated using standard
ultrasound equipment with spectral and color Doppler capabilities. The
velocity of flow in the proximal segment of the left renal vein (17.5 cm/s)
was found to be significantly lower than that in both the distal left renal
vein (121 cm/s) and the right renal vein (37 cm/s). The flow velocity in
the proximal left renal vein decreased with decrease in the aortomesenteric
distance and angle. Testicular vein diameters greater than 3 mm were
statistically associated with decreased superior mesenteric artery angle. A
significant association also was found between the left testicular vein
diameter (in Valsalva maneuver) and inversion of flow. The decrease in flow
velocity in the left renal vein proximal to the bifurcation of the superior
mesenteric artery from the aorta supports the "nutcracker" theory. An
association was found between the decrease of superior mesenteric artery
angle and the increase in testicular vein diameter. Another association
exists between the presence of reflux during Valsalva maneuver and
increased testicular vein diameter. These finding were significant only for
testicular vein diameter values greater than 3 mm.