Histological evidence of decreased contralateral testicular blood flow during ipsilateral testicular torsion

Objective To evaluate contralateral testicular blood flow by histological examination of arterioles during ipsilateral testicular torsion. Materials and methods The study comprised two groups of 20 male albino rats (weight 250-270 g). The control group underwent a sham operation, while in the second group the left testes were twisted clockwise by 720 degrees. All rats underwent bilateral orchidectomy 24 h after the initial intervention. Three slides for each testis (n = 240) were evaluated randomly while unaware of treatment to determine the total number of arterioles, the percentage of collapsed and open arterioles, the diameter of open arterioles and the presence or absence of blood cells in the lumen. Differences were assessed using t-tests for paired and independent samples. Results Very few arterioles were collapsed in both testes of the control group and in the ipsilateral testes of the torsion group, but half the arterioles in the contralateral testes of the torsion group were collapsed. The difference between the contralateral testes of the two groups and between the ipsilateral and contralateral testes in the torsion group were significant. The diameter of uncollapsed arterioles did not differ significantly among either testes of the control and torsion groups and either testes in each group. Both testes in the torsion group had significantly more arterioles containing blood cells than those in the control group. The difference between the testes in the torsion group was also significant, but was not in the control group. Conclusion There was histological evidence of decreased brood flow in the contralateral testis during unilateral testicular torsion; contralateral testicular damage during unilateral testicular torsion may result from hypoxia caused by decreased blood flow.