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, 2006). Taken together such data suggest that the relevance of epididymis US in the evaluation of infertile men needs to be determined by introducing objective and reproducible criteria of ultrasound evaluation http://www.selleck.cn/products/Romidepsin-FK228.html coupled with well-defined patient selection criteria. Here, we evaluated US size of the caput and of the corpus epididymis in azoospermic and in non-azoospermic infertile men. Epididymis diameters were compared with US testicular volume, serum level of FSH and semen parameters to define the clinical value of epididymis ultrasonography in subfertile men. Four hundred and twenty-seven men (aged 36?��?5?years) who had sought medical care because of couple infertility of least 18?months were included in a retrospective study, which evaluated semen parameters, hormones levels and scrotal US. Patients with scrotal pain and/or scrotal enlargement indicative for orchiepididymitis were excluded from the study. The local institutional human research committee approved the study. FSH blood levels and total testosterone were measured by a chemiluminescent microparticle immunoassay (ARCHITECT System; Abbott, Longford, Ireland); http://www.selleckchem.com/products/nutlin-3a.html according to the manufacturer, the analytical sensitivity was http://www.selleckchem.com/products/AC-220.html (Fuse et?al., 1990), assuming that the testis is an ellipsoid. The mean value of the two testicular volumes (Testes-M) in each case was used for statistical analysis. The anatomic position of the epididymis was determined using standard longitudinal and transverse scanning of the testis as reference planes. Caput epididymis size (mm) was measured on a longitudinal scan, when the caput appears as a pyramidal structure above the upper pole of the testis, and the maximal diameter was measured from the top to the base of the pyramid (Puttemans et?al., 2006) (Fig.1a). The maximal antero-posterior diameter (mm) of the corpus was measured at its middle portion on a longitudinal scan when it was clearly differentiated from the testis (Fig.?1b).