This testis has undergone infarction following testicular torsion.
Torsion is an uncommon condition, but a medical emergency.
It occurs when twisting of the spermatic cord cuts off the venous drainage, leading to hemorrhagic infarction. Greater mobility from incomplete descent or lack of a scrotal ligament predisposes to this condition. Immediate treatment by surgically untwisting and suturing the cord in place to prevent future torsion will prevent infarction.