Overview

Cryptorchidism denotes a condition in which one or both testicles do not move into the scrotum before or shortly after birth. It is usually identified in newborns and infants during routine examination. The condition ranges from a testis that is high in the groin and palpable to one that remains inside the abdomen and is not felt on exam.

Types and clinical features

Clinicians distinguish several patterns, which affect management and prognosis.

  • Undescended (true) testis: stopped along the normal path from the abdomen to the scrotum.
  • Retractile testis: can be moved into the scrotum and stays there but may be drawn up by a strong cremasteric reflex.
  • Ascending (acquired) testis: initially descended but later moves upward and becomes undescended.
  • Ectopic testis: deviates from the normal pathway and lies outside the typical route.

Causes and development

The process of descent is influenced by hormonal signals, anatomic structures, and genetic factors. Premature infants have a higher chance of undescended testicles because descent often occurs late in gestation. In many cases no single cause is identified, and multifactorial influences are suspected.

Diagnosis and treatment

Diagnosis is primarily by physical examination; imaging is reserved for nonpalpable testes or when the location is unclear. Management emphasizes timely intervention to reduce later risks. Some testes descend spontaneously within the first months of life, so observation is common during this period. If descent does not occur, surgical relocation (orchidopexy) is the standard treatment, typically performed in infancy to early childhood. Hormonal treatments have limited and variable success and are used selectively.

Complications, prognosis and public health

Undescended testes are associated with an increased risk of infertility, testicular cancer, inguinal hernia, and testicular torsion. Early surgical correction improves fertility prospects and may reduce cancer risk but does not eliminate it. Routine newborn screening and pediatric follow-up are important so undescended testes are identified and managed promptly.

History and notable facts

The condition has been recognized for centuries and surgical approaches evolved as anatomy and anesthesia advanced. Today cryptorchidism is a common pediatric urologic concern, and consensus guidelines guide the timing of referral and repair to balance spontaneous descent against risks of delay.