Prehn's sign

Prehn's sign is a clinical sign which is used in the diagnosis of testicular torsion. It is named after American urologist, John Prehn.

Definition

Prehn's sign is defined as relief of pain when the scrotum is lifted. It is used to differentiate between testicular torsion and epididymitis, two conditions with similar symptoms but different treatments.

Clinical Use

In the case of testicular torsion, lifting the scrotum generally does not relieve pain, while in epididymitis, it often does. However, the reliability of Prehn's sign in diagnosing testicular torsion is controversial, with some studies suggesting it is not a reliable indicator.

History

Prehn's sign was first described by American urologist John Prehn in 1924. He suggested that if lifting the scrotum relieved pain, it was likely that the patient had epididymitis rather than testicular torsion.

Controversy

Despite its widespread use, the reliability of Prehn's sign in diagnosing testicular torsion is controversial. Some studies have found that it is not a reliable indicator, while others have found it to be useful. As a result, it is generally recommended that Prehn's sign be used in conjunction with other diagnostic tools, rather than as a standalone test.

See Also

• Testicular torsion
• Epididymitis
• John Prehn

References

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