<prompt> In cryptorchidism, hallmark histological changes appear in testis at:4 months6 months8 months1 year  <response>: Histopathology- Abnormal germ cell histology- 1-2 Years: Earliest change - Hypoplasia of Leydig cells 1 month of age- Degeneration of Seoli Cells- Delayed disappearance of gonocytes- Delayed appearance of adult dark spermatogonia 