• A condition in which one or both testicles fail to move from the abdomen, where they develop before birth, into the scrotum. Undescended testicles may increase the risk for development of testicular cancer.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• A developmental defect in which a TESTIS or both TESTES failed to descend from high in the ABDOMEN to the bottom of the SCROTUM. Testicular descent is essential to normal SPERMATOGENESIS which requires temperature lower than the BODY TEMPERATURE. Cryptorchidism can be subclassified by the location of the maldescended testis.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Failure of testes to descend into scrotum.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Testis in inguinal canal. That is, absence of one or both testes from the scrotum owing to failure of the testis or testes to descend through the inguinal canal to the scrotum.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2021
• The persistent failure of one or both testes to descend into the scrotum.
  NICHD Pediatric Terminology
  U.S. National Cancer Institute, 2021
• (undescended testes) The failure of one or both testes of a male fetus to descend from the abdomen into the scrotum during the late part of pregnancy. If not surgically corrected in early childhood, males may be at increased risk for testicular cancer later in life.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• Cryptorchidism is failure of one or both testes to descend into the scrotum; in younger children, it is typically accompanied by inguinal hernia. Diagnosis is by testicular examination, sometimes followed by laparoscopy to look for testes that cannot be felt on examination. Imaging studies are rarely indicated. Treatment is surgical...
  Merck Manuals
  Merck & Co., Inc., 2020
• Cryptorchidism is the most common genital problem encountered in pediatrics. Cryptorchidism literally means hidden or obscure testis and generally refers to an undescended or maldescended testis.
  Medscape
  WebMD, 2019
• An undescended testicle (cryptorchidism) is a testicle that hasn't moved into its proper position in the bag of skin hanging below the penis (scrotum) before birth. Usually just one testicle is affected, but about 10 percent of the time both testicles are undescended.
  Mayo Clinic
  Mayo Foundation for Medical Education and Research
• Cryptorchidism, or undescended testis, is when one or both testes are not present within the dependent portion of the scrotal sac.
  Epocrates
  Athenahealth, Inc., 2019
• Cryptorchidism, disorder in which one or both of the testes do not descend spontaneously to the usual position in the scrotum. (The testes normally descend around the time of the male infant's birth.) Usually only one testis fails to descend into the scrotum; the other, descended testis suffices to...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020