Figure 16b. Polyorchidism. (a) US image demonstrates an oval, isoechoic mass (M) with a homogeneously echogenic pattern identical to that of the left testicle (T). The mass is inferior to the left testicle and demonstrated flow comparable to that seen in the testicle at color Doppler US. (b) Turbo spin-echo T2-weighted MR image shows a left-sided oval structure (M) with homogeneous high signal intensity. The structure had intermediate signal intensity on T1-weighted images (not shown). These findings are characteristic of normal testicular tissue. The mass is surrounded by a continuous band of low signal intensity, a finding that represents the tunica albuginea. A left varicocele is also seen. T = testicle.