Another potential cause of acute testicular pain involves vestigial structures that you may remember in the deepest recesses of you medschool brain.

Appendix testis

Derived from the Müllerian system

They are paired embryonic structures that eventually regress in males and form the Fallopian tubes, uterus, cervix and upper third of the vagina in girls.

Appendix epididymis

Derived from the Wolffian system

These paired embryonic structures eventually become the epididymis, vas deferens, and seminal vesicles.

"Gray1148". Licensed under Public domain via Wikimedia Commons -

“Gray1148”. Licensed under Public domain via Wikimedia Commons –

These ‘lil nubbins are clinically important because they can torse and lead to acute testicular pain. This usually occurs between age 7 and 12 years. The initial pain is usually severe because the aforementioned nubbin is ischemic which leads to infarction and necrosis. Ischemia hurts. You may see a reactive hydrocele, but the pathognomonic physical exam finding, which I see once every 5-6 years is the “blue dot sign.”

Blue dot sign: Ischemic/infarcted embryonic remnant is seen on the right side through the thin scrotal wall. Attribution:

You can diagnose this clinically if the patient is in the right age bracket and has a blue dot sign. Otherwise get an ultrasound if you cannot rule out torsion of the testis. The pain is expected to last 5-10 days and will be most intense for the first 2-3 days. Management is conservative and consists of:

  • Analgesics
  • Rest
  • Scrotal support