Hi doctors, was just wondering what is a testicular atrophy!?

Shrinking testes. Can occur after testicular torsion which if untreated can lead to complete atrophy (death) of affected testis. Testes can shrink/atrophy after mumps, anabolic steroid use, radiation or chemotherapy for cancer. Testicular atrophy leads to reduced testosterone and sperm production leading to sterility, loss of libido ; overall reduced strength, energy ; drive, .