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Is your son experiencing sudden pain in his testicles? Let's talk about Appendix Testis (Hydatid of Morgagni)!

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📅 Updated: Jul 14, 2026 • ⏱ 6 min read • Editorial policy
Is your son experiencing sudden pain in his testicles? Let's talk about Appendix Testis (Hydatid of Morgagni)!
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If your little boy was playing and suddenly started crying, "Mommy... my bone hurts!", wouldn't any mother or father be very scared? It's a very sensitive area, so even a little pain is difficult for the child to bear. One of the main reasons for such sudden pain is the twisting of the little part we're going to talk about today called the 'Appendix Testis'. Even if the name sounds like a big deal, don't be afraid. Let's talk about this simply.

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What exactly is Appendix Testis?

Simply put, this is a very small, useless piece of tissue that hangs from the top of a boy's testicle. Think of it like a small piece of thread left over after sewing a dress.

This will become clearer to you when you understand how it develops. During the early stages of a baby's development in the womb, there is a tube that is used to develop a girl's reproductive system (uterus, fallopian tubes, etc.). It is called the (Müllerian duct). However, when a boy develops, this tube is no longer needed. So it gradually becomes inactive and disappears. The tiny piece left over from that disappearing tube is called the Appendix Testis.

That means it's not a disease or anything unusual. It's completely normal, affecting about 8 out of 10 boys. Some boys may even have it in both testicles.

If this is of no use, how do you start the problem?

Although this Appendix Testis is useless, it is attached to the testicle by a small stalk. Like a small fruit hanging from a tree. Sometimes, for no apparent reason, this small piece of tissue can twist and turn on itself. That's what we call Appendix Testis Torsion in medicine.

Torsion means twisting. When it twists like this, the blood supply to that small piece of tissue stops, and it slowly begins to die. This is what causes the sudden, sharp pain.

What are the symptoms that can be seen in this situation?

This Appendix Testis Torsion is most commonly seen in boys between the ages of 7 and 12. If something similar happens to your son, keep an eye out for these symptoms.

Symptom Simple explanation
Sudden, sharp pain The child may suddenly cry out in pain. This pain is usually felt in one testicle (often in the upper part).
Swelling and redness of the scrotum The scrotum on the side of the pain may become red and slightly swollen.
"Blue Dot Sign" This is a very important sign. Because the twisted piece of tissue has lost blood and is turning black/blue, it can sometimes be seen as a small blue dot through the skin of the scrotum. Doctors will examine this carefully.
Stomach ache and vomiting The pain is so sharp that some children may feel as if it is shooting up into their stomach. They may also feel like vomiting.

Extremely important: Do not confuse Appendix Testis Torsion with Testicular Torsion!

This is the most important part of this article. Some people may confuse these two names because they sound similar. However, there is a big difference between these two conditions.

1. Appendix Testis Torsion (what we're talking about): This is just a small, useless piece of tissue that twists. Although this is painful, it doesn't cause any damage to the testicle. Therefore, this is not a condition that requires emergency surgery.

2. Testicular Torsion: This is an extremely serious and emergency condition . It is not the testicle that is twisted. It is the spermatic cord, which is the main blood vessel that supplies blood to the testicle itself. If this happens, the blood supply to the testicle can be completely cut off within a few hours, causing it to become permanently inoperable (dead).

So remember this: If your son has testicular pain, don't stay home and think, "This is probably just a twisted testicle, nothing to worry about." Because the symptoms of the two are very similar. Only a doctor can determine exactly which of the two is the case. So immediately take your child to the nearest doctor or to the emergency room (ETU) of a hospital.

The doctor will examine the child and, if necessary, perform an ultrasound scan to confirm exactly which of these two conditions is present.

How is it treated?

After the doctor examined him and confirmed that this was an Appendix Testis Torsion and not a serious Testicular Torsion, the treatment was very simple.

  • Rest: You should avoid running and playing for a few days and let your child get plenty of rest.
  • Ice: Applying an ice pack wrapped in a clean cloth to the painful area for 10-15 minutes can help reduce swelling and pain.
  • Painkillers: Give the prescribed dose of paracetamol or non-steroidal anti-inflammatory drugs (NSAIDs) (e.g., ibuprofen) as prescribed by the doctor.
  • Scrotal elevation: While the child is lying down, placing something like a small, soft cloth under the scrotum to support it slightly upward can help relieve pain.

Usually, with this treatment , the pain and swelling will be almost completely gone within a week. The body will dissolve and absorb the small piece of tissue that has been twisted. Surgery is rarely necessary. Only if the pain is unbearable or if there is doubt about the diagnosis.

💡 Take-Home Message

  • The Appendix Testis is a small, normal, harmless, and useless piece of tissue found in the testicles of boys.
  • This torsion can cause sudden, sharp pain, especially in children between the ages of 7-12.
  • This condition is completely different from Testicular Torsion, which is a serious condition that requires immediate surgery.
  • However, any sudden pain in a child's testicles should never be ignored. A doctor should be consulted immediately to determine whether it is a serious condition.
  • Treatment for Appendix Testis Torsion can usually be cured with rest, ice, and painkillers.
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What are the symptoms that can be seen in this situation?

This Appendix Testis Torsion is most commonly seen in boys between the ages of 7 and 12. If something similar happens to your son, keep an eye out for these symptoms.

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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.