Journal of magnetic resonance imaging : JMRI · 2011
Diffusion-weighted magnetic resonance imaging in the detection of testicular torsion: feasibility study.
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Maki Daisuke, Watanabe Yuji, Nagayama Masako, Ishimori Takayoshi, Okumura Akira, Amoh Yoshiki, Nakashita Satoru, Terai Akihito, Dodo Yoshihiro
Аннотация
PURPOSE: To investigate the feasibility and usefulness of diffusion-weighted magnetic resonance imaging in the detection of testicular torsion.
MATERIALS AND METHODS: Institutional Review Board approval and informed consent from all participants were obtained. Consecutive 28 patients with acute scrotal symptoms were included in this study. Fat-suppressed T2-weighted, dynamic subtraction contrast-enhanced, and diffusion-weighted images were obtained in the coronal plane with a 1.5 T MR unit. An apparent diffusion coefficient (ADC) map was reconstructed from the diffusion-weighted images obtained with b-factor of 0 and 800 s/mm(2). Comparisons of ADC values between the affected and nonaffected testes were performed with Mann-Whitney's U-test.
RESULTS: Diffusion-weighted and ADC images with diagnostic quality were obtained in 23 out of the 28 patients (82%). In testicular torsion (n = 9), the mean ADC value of the twisted testes was significantly lower than that of the nonaffected testes (0.750 ± 0.297 vs. 1.017 ± 0.165 × 10(-3) mm(2)/sec, P < 0.05). In other scrotal disorders (n = 14), there was no significant difference in the mean ADC value of the testes between the affected and nonaffected side (P = 0.655). The affected-to-nonaffected ratio of ADC value was significantly lower in testicular torsion than that in other scrotal disorders (P < 0.05).
CONCLUSION: Diffusion-weighted imaging of the scrotum with testicular ADC measurement can allow for the detection of testicular torsion without any use of contrast media.
MATERIALS AND METHODS: Institutional Review Board approval and informed consent from all participants were obtained. Consecutive 28 patients with acute scrotal symptoms were included in this study. Fat-suppressed T2-weighted, dynamic subtraction contrast-enhanced, and diffusion-weighted images were obtained in the coronal plane with a 1.5 T MR unit. An apparent diffusion coefficient (ADC) map was reconstructed from the diffusion-weighted images obtained with b-factor of 0 and 800 s/mm(2). Comparisons of ADC values between the affected and nonaffected testes were performed with Mann-Whitney's U-test.
RESULTS: Diffusion-weighted and ADC images with diagnostic quality were obtained in 23 out of the 28 patients (82%). In testicular torsion (n = 9), the mean ADC value of the twisted testes was significantly lower than that of the nonaffected testes (0.750 ± 0.297 vs. 1.017 ± 0.165 × 10(-3) mm(2)/sec, P < 0.05). In other scrotal disorders (n = 14), there was no significant difference in the mean ADC value of the testes between the affected and nonaffected side (P = 0.655). The affected-to-nonaffected ratio of ADC value was significantly lower in testicular torsion than that in other scrotal disorders (P < 0.05).
CONCLUSION: Diffusion-weighted imaging of the scrotum with testicular ADC measurement can allow for the detection of testicular torsion without any use of contrast media.