# Undescended Testis

> Undescended testis for NEET-PG Surgery: orchidopexy timing 6-18 months, Fowler-Stephens, retractile testis, imaging myths and malignancy risk.

- Canonical URL: https://prepelephant.com/topics/neet-pg/surgery/undescended-testis
- Exam / course: NEET-PG · Subject: Surgery
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Undescended Testis", PrepElephant, https://prepelephant.com/topics/neet-pg/surgery/undescended-testis

## Direct answer

Six to eighteen months is the window for orchidopexy in undescended testis: about 3 percent of full-term boys are born undescended, most descend spontaneously by 3 to 6 months, and a testis still undescended at 6 months will rarely arrive, so surgery is scheduled once that deadline passes. Orchidopexy mobilises the cord, delivers the testis into a subdartos scrotal pouch without tension and fixes it. Intra-abdominal testes need the Fowler–Stephens approach, sacrificing the testicular vessels and relying on the artery to the vas and cremasteric collaterals, in one or two stages. Hormonal therapy is no longer recommended as primary treatment, and ultrasound adds nothing to examination. Early surgery preserves fertility potential and leaves the testis palpable for lifelong cancer surveillance.

## What you must remember

- **Epidemiology:** about 3 percent at term (up to a third of preterm boys), falling below 1 percent by one year — postnatal descent, when it happens, occurs by 3–6 months.
- **Timing rule:** orchidopexy between 6 and 18 months; histology shows progressive germ-cell loss beyond that window.
- **Examination is the investigation:** palpable testes need no imaging, and ultrasound is unreliable for impalpable ones — the pathway is examination under anaesthesia, then laparoscopy.
- **Fowler–Stephens:** testicular vessels divided, viability from the deferential (artery to vas) and cremasteric supply; the two-stage version suits high intra-abdominal testes.
- **Why operate:** fertility (unilateral paternity near 90 percent, bilateral much lower), torsion risk, cosmesis, and examinability — malignancy risk falls with early surgery but never reaches baseline.
- **Retractile versus undescended:** a retractile testis can be milked into the scrotum and stays; it needs observation with annual review for later ascent, not surgery.
- **Malignancy numbers:** historical relative risk of testicular cancer (seminoma predominates) after undescended testis is quoted around 3–6-fold, higher for intra-abdominal testes.
- **Indian reality:** school-age presentation of long-standing undescended testis is still routine; counselling covers the torsion-prevention and surveillance value of surgery even when the fertility window has closed.

## A pathway through a non-palpable testis

A 14-month-old whose left testis has never been seen or felt. Examination under anaesthesia confirms an empty scrotum and empty canal. Diagnostic laparoscopy then delivers one of three verdicts. Vessels and vas entering a patent internal ring: a canalicular or peeping testis — groin exploration and orchidopexy. A testis on a leash 2 cm above the ring: primary single-stage Fowler–Stephens if the reach allows, or clip the vessels now and bring the testis down in a second stage 3–6 months later. Blind-ending vessels and vas: a vanished testis — nothing further, with excision of any scrotal nubbin. Parents are counselled honestly at each turn: unilateral paternity rates approach normal, the cancer risk stays modestly elevated lifelong, and monthly self-examination after puberty is the standing instruction.

## Where students slip

The imaging reflex is the first error — ordering scrotal ultrasound for an undescended testis; guidelines are blunt that ultrasound adds nothing for palpable testes and misleads for impalpable ones, yet the option appears in nearly every stem. The second is conflating retractile with undescended: a retractile testis reaches and remains in the scrotum after cremasteric relaxation and is observed, not operated. The hormone question still catches candidates — hCG and GnRH have low success rates and no current recommendation as primary therapy; surgery is the answer. Finally, know the Fowler–Stephens collateral logic verbatim: divide the testicular artery and vein, preserve the vas with its artery and the cremasteric supply.

## Frequently asked questions

### When should orchidopexy be performed?
Between 6 and 18 months of age, because spontaneous descent beyond 6 months is rare and germ-cell loss progresses with delay.

### What operation suits a high intra-abdominal testis?
The Fowler–Stephens approach — dividing the testicular vessels and relying on the artery to the vas and cremasteric collaterals, often staged.

### Is ultrasound needed before orchidopexy?
No — palpable testes need examination alone, and for impalpable testes ultrasound is unreliable; the pathway is examination under anaesthesia followed by diagnostic laparoscopy.

### Does orchidopexy eliminate the risk of testicular cancer?
It repositions the testis for surveillance and likely lowers risk when done early, but relative risk remains elevated at roughly 3–6-fold in historical series.

### How does a retractile testis differ from an undescended one?
A retractile testis can be brought into the scrotum and stays there, requiring observation; an undescended testis cannot be made to stay and needs surgery.