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Infertility affects ∼7% of all men. Despite much progress, mainly in genetics, its etiology remains obscure in ∼50% of cases. To fill this gap, imaging of the male genital tract (MGT) has progressively expanded, providing useful information in the assessment of MGT abnormalities.

A critical, systematic review of the available literature was performed using Medline, with no restrictions regarding date of publication (i.e. from inception date until March 2014), along with analysis of previous reports in color Doppler ultrasound (CDUS) atlas textbooks. Normal anatomy and sonographic characteristics of the MGT have also been summarized.

Testicular volume (TV) is tightly associated with both sperm and hormonal parameters. Ultrasound (US) offers a greater accuracy in TV measurement than Prader orchidometer (PO …