Undescended testes: early versus late maldescent

Area of Science:

• Pediatric Surgery
• Urology
• Developmental Biology

Background:

• Undescended testes (cryptorchidism) are a common congenital anomaly.
• The presence and extent of a hernial sac associated with undescended testes are significant clinical findings.
• Understanding the timing and etiology of testicular maldescent is crucial for effective management.

Purpose of the Study:

• To evaluate the association between a complete hernial sac and undescended testes.
• To differentiate between early and late forms of testicular maldescent based on age and associated findings.
• To propose a classification for maldescent based on presumed etiological factors.

Main Methods:

• Retrospective review of 468 orchidopexy cases.
• Analysis of the presence and extent of hernial sacs in relation to patient age.
• Correlation of findings with theories of testicular descent and maldescent.

Main Results:

• A complete hernial sac extending to or beyond the testis was found in 84% of patients under 5 years old.
• In contrast, only 23% of patients over 5 years old had a complete hernial sac.
• The processus vaginalis length increases with age, suggesting it is not the primary cause of late maldescent.

Conclusions:

• The high incidence of complete hernial sacs in younger patients suggests 'early maldescent' due to failure of closure of the processus vaginalis, likely of antenatal origin.
• In older patients, maldescent is likely 'late maldescent' or 'ascending testis', occurring during the prepubertal period.
• A proposed classification distinguishes between early and late maldescent, aiding in understanding the underlying pathophysiology.