Riassunto
Il didimo ha un asse maggiore sagittale, leggermente obliquo, compreso tra 42 e 58 mm, un diametro laterolaterale di 18–24 mm e un diametro antero-posteriore di 30–36 mm. Il volume (formula dell’ellissoide) normalmente risulta essere compreso tra 14 e 25 mL. All’ecografia (US) il parenchima testicolare è caratterizzato da fini echi addensati e omogenei, la cui intensità è bassa nel periodo prepuberale e aumenta, talora disomogeneamente, fino a raggiungere un livello medio nell’adulto, simile a quella della tiroide. La sottile tunica albuginea è riconoscibile come una linea ipoecogena sottostante il foglietto viscerale, iperecogeno, della tunica vaginale propria (Fig. 18.1 A). Il mediastino testicolare (mediastinum testis), a localizzazione posteriore, è rappresentato da un’area iperecogena ovalare o triangolare nella scansione assiale e allungata in quella sagittale (Fig. 18.1 B). La rete testis non è normalmente visibile. I vasi si identificano come sottili strie ipoecogene dirette obliquamente dal margine anteriore a quello posteriore verso il mediastino.
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Agostini, S. et al. (2010). Diagnostica per immagini della patologia scrotale non neoplastica. In: Imaging dell’Apparato Urogenitale. Springer, Milano. https://doi.org/10.1007/978-88-470-1769-6_18
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