Male pelvis rule 1 : Anatomy of testicles

}Gray scale ultrasound of testis. Normal homogeneous echogenicity is finding that characterizes normal testicle. The linear echogenic band running through the testis is a normal structure called the mediastinum testis 

Transverse view of both testicles on gray scale ultrasound. Showing bilaterally symmetric testicles is useful in excluding a focal process. This view is sometimes called the "Dolly Parton" view.

Duplex ultrasound of testis. In this patient with suspected torsion, normal color flow (red and blue represents flow) and spectral analysis (arrows) show both venous and arterial flow thereby excluding torsion.