Many people experience recurring symptoms around the navel or lower abdomen, such as unusual discharge, vague pain, or repeated infections that seem to come and go without a clear reason. These symptoms are often dismissed as minor skin issues or simple infections, but in some cases, the underlying cause may be more complex and significant—known as a urachal remnant.The urachus is a structure that exists during fetal development. It is a قناة (canal) that connects the bladder to the umbilicus (navel) before birth. Normally, this canal closes completely after birth. However, problems arise when part of it remains open or does not close properly. This can lead to recurrent infections, cyst formation, or even persistent discharge from the navel.In this Dalily Medical article, we will explore everything you need to know about the urachus: why it occurs, its symptoms, when it becomes dangerous, and how it can be treated effectively—whether through medication or surgical intervention.

1. What is the urachus (urachal remnant)?

The urachus is a remnant of a tube that exists during fetal development. It connects the bladder to the umbilicus (navel) while the baby is still in the womb.
After birth, this canal is supposed to close completely. However, in some cases, parts of it may remain open and fail to disappear fully.

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2. Is the urachus dangerous?

In most cases, a urachal remnant is not considered dangerous. However, it may cause discomfort if complications such as infection or cyst formation occur.
The main concern is not its presence itself, but the complications that may result from it.

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3. What are the symptoms of a urachal remnant?

Symptoms may include:

• Pain in the lower abdomen
• Discharge from the navel (clear or pus-like)
• Redness or swelling around the umbilical area
• Sometimes fever or recurrent infections

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4. Can a urachal remnant disappear on its own?

In some cases in young children, minor urachal structures may close gradually over time.
However, in adults, a well-formed urachal remnant usually does not resolve on its own.

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5. How is a urachal remnant diagnosed?

Diagnosis may include:

• Abdominal ultrasound
• In some cases, a CT scan
• Laboratory analysis of discharge if infection is present

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6. Can it be treated with medication only?

Medications, especially antibiotics, are used to treat associated infections.
However, they do not remove the urachal remnant itself, so symptoms may return later.

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7. When does it require surgery?

Surgical intervention is recommended in cases such as:

• Recurrent infections
• Presence of a cyst or abscess
• Persistent discharge over time
• Connection or extension toward the bladder

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8. Is surgery dangerous?

No, surgery is generally safe in most cases, especially when performed laparoscopically.
It has a high success rate and a low risk of complications.

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9. Can a urachal remnant return after surgery?

Recurrence is rare because surgery aims to completely remove the remnant.
However, mild temporary infection or irritation may occur if wound healing is delayed.

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10. What is the difference between a urachal remnant and a simple navel infection?

• Navel infection: A superficial skin infection affecting the skin around the umbilicus.
• Urachal remnant: An internal congenital remnant of a fetal canal that may cause recurrent infections or cyst formation.

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11. Are children more affected than adults?

Symptoms can appear at any age, but the condition is often detected during childhood or early adolescence.

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Stages of the Urachus (Urachal Remnant)

The stages of the urachus are related to its natural development during fetal growth and whether it closes properly after birth.

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1. Fetal stage (presence of the urachal canal)

Early in fetal development, there is a tube called the urachal canal.
It connects:

• The urinary bladder
• The umbilicus (via the umbilical cord)

Its main role is related to fetal urinary system development.

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2. Early closure stage (late pregnancy)

As pregnancy progresses, the urachus begins to narrow gradually and loses its function.

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3. Normal closure stage (after birth)

Normally after birth:

• The urachal canal closes completely
• It becomes a small fibrous ligament
• It has no functional role

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4. Persistence stage (urachal remnants)

In some cases, the canal does not close completely, leading to:

• Urachal cyst
• Urachal sinus
• Urachal fistula
• Vesicourachal diverticulum

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5. Symptomatic stage (in some cases)

These remnants may remain silent for years but can later cause:

• Navel discharge
• Lower abdominal pain
• Recurrent infections

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Types of Urachal Remnants

Urachal remnants are classified based on how much of the canal remains open, which determines symptoms and treatment.

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1. Patent urachus (urachal fistula)

This is the most obvious and severe type.

What happens:

The canal remains completely open between the bladder and the umbilicus.

Symptoms:

• Urine discharge from the navel
• Persistent moisture around the umbilical area
• Recurrent infections 

2. Urachal cyst

This is the most common type of urachal remnant.

What happens:

The canal closes at both ends, but the middle portion remains open and filled with fluid, forming a cyst.

Symptoms:

• A lump or swelling in the lower abdomen
• Pain when infection occurs
• It may remain completely asymptomatic for long periods

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3. Urachal sinus

What happens:

The urachal canal closes on the bladder side but remains open toward the umbilicus (navel).

Symptoms:

• Discharge from the navel (clear or pus-like)
• Recurrent infections around the umbilical area
• Sometimes an unpleasant odor

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4. Urachal diverticulum

What happens:

The canal closes on the umbilical side but remains connected to the bladder.

Symptoms:

• Often asymptomatic
• Recurrent urinary tract infections in some cases
• Occasionally pain or difficulty during urination

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Causes of urachal remnant

Urachal remnants occur due to incomplete closure of the urachal canal during fetal development. Although the exact cause is not always known, several factors are believed to contribute:

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1. Abnormal fetal development

During normal development, the urachal canal is supposed to close completely before birth.
In some cases, there is a delay or defect in this closure process, leaving parts of the canal open.

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2. Congenital causes (genetic or sporadic)

It may result from:

• A minor congenital defect present from early development
• Or a random developmental variation with no clear cause

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3. Incomplete postnatal involution

In some cases, the canal begins to close after birth but does not fully seal, leaving:

• A cyst
• A small tract
• Or an abnormal opening

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4. Rare association with other disorders

In rare cases, urachal remnants may be associated with abnormalities of:

• The bladder
• The urinary system in general

However, this association is uncommon.

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Symptoms of urachal remnants

Symptoms vary depending on the type (cyst – sinus – fistula). Some cases may remain asymptomatic. When symptoms occur, they may include:

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1. Umbilical discharge (most common symptom)

This is one of the most frequent signs and may appear as:

• Clear or yellowish fluid
• Pus in case of infection
• Foul-smelling discharge
• Intermittent or recurrent drainage

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2. Lower abdominal pain

• Pain in the mid-lower abdomen above the pubic area
• May be constant or intermittent
• Worsens during infection

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3. Lower abdominal mass or swelling

• A small palpable lump in the midline abdomen
• May be tender to touch
• Common in urachal cysts

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4. Recurrent umbilical infections

• Redness around the navel
• Warmth and tenderness
• Repeated infections despite treatment

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5. Urine discharge from the umbilicus (rare but important)

In urachal fistula cases:

• Urine may leak from the navel
• More noticeable during urination
• Requires urgent medical evaluation

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6. Fever (in case of infection)

• Mild or high fever
• General fatigue and weakness
• Usually associated with infected cysts or tracts

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7. Pain or burning during urination (sometimes)

• May occur if the remnant is connected to the bladder
• Or in case of associated urinary tract infection

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Diagnosis of urachal remnant

Diagnosis involves several steps to confirm the presence and type of urachal abnormality.

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1. Clinical examination

The first step includes:

• Examining the umbilical area and lower abdomen
• Checking for:
  • Discharge from the navel
  • Redness or swelling
  • Presence of a lump
• Pain or discharge may appear during pressure

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2. Analysis of discharge (if present)

If discharge exists:

• A sample is collected and analyzed
• To detect:
  • Bacterial infection (pus)
  • Possible urinary origin of fluid

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3. Ultrasound (sonography)

One of the most important diagnostic tools:

• Detects cysts or tracts below the umbilicus
• Shows size and location clearly
• Helps differentiate between types of urachal remnants

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4. CT scan

Used in more complex cases:

• Provides detailed internal imaging
• Shows the relationship with the bladder
• Often used before surgery planning

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5. MRI

Used in selected cases:

• Gives high-resolution soft tissue detail
• Helpful when ultrasound or CT is inconclusive

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6. Contrast studies (Sinogram or Cystography)

Specialized imaging tests:

• Contrast dye is injected into the bladder or umbilicus
• X-rays track the flow of dye
• Identifies abnormal connections between bladder and umbilicus
• Very useful in diagnosing urachal fistula

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Complications of urachal remnants

If left untreated or undiagnosed, urachal remnants may lead to several complications:

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1. Recurrent umbilical infections

• Persistent redness and pain
• Repeated pus or foul-smelling discharge
• Poor response to antibiotics alone

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2. Abscess formation

• Pus collection inside the cyst
• Severe lower abdominal pain
• Visible swelling
• May require urgent drainage

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3. Urachal cyst formation

• Fluid-filled sac formation
• Gradual enlargement
• Pressure or discomfort in the lower abdomen
• Possible infection

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4. Chronic umbilical discharge

• Continuous or intermittent drainage
• Clear or purulent fluid
• Causes discomfort and odor

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5. Recurrent urinary tract infections

• More common in urachal diverticulum
• Burning during urination
• Frequent UTIs without clear cause

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6. Urine leakage from the navel (severe cases)

• Seen in urachal fistula
• Direct communication between bladder and umbilicus
• Requires medical intervention

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7. Chronic lower abdominal pain

• Persistent or recurrent pain
• Worsens with infection or movement
• Affects daily comfort

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8. Rare complications (neglected cases)

• Long-standing inflammation
• Possible abnormal changes in cyst wall
• Surgical removal is usually recommended when symptoms persist

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Prevention of urachal complications

Since urachal remnants are congenital, they cannot be fully prevented, but complications can be minimized through early management:

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1. Early detection

Watch for symptoms such as:

• Umbilical discharge
• Lower abdominal pain
• Recurrent infections

Early diagnosis reduces complications significantly.

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2. Good umbilical hygiene

• Keep the navel clean and dry
• Avoid buildup of discharge
• Clean gently without excessive pressure

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3. Prompt treatment of infections

• Do not ignore redness or discharge
• Start appropriate treatment under medical supervision
• Prevent repeated infections

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4. Regular medical follow-up

• Especially in chronic or cystic cases
• Ultrasound monitoring may be required
• Helps prevent progression

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5. Avoid relying on antibiotics alone

• Antibiotics treat infection only
• They do not remove the urachal remnant
• Full evaluation is necessary

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6. Surgical treatment when needed

• Recommended in recurrent or severe cases
• Especially for cysts, fistulas, or persistent symptoms
• Considered the definitive treatment

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Complications of untreated urachal remnant

If not properly treated, complications may include:

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1. Chronic or recurrent infections

• Persistent umbilical infection
• Repeated pus discharge
• Poor response to medication

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2. Abscess formation

• Severe pus collection
• Intense pain and swelling
• May require emergency surgery

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3. Fistula formation

• Abnormal connection between bladder and umbilicus
• Urine leakage from the navel
• Recurrent infections and complications

4. Recurrent urinary tract infections (UTIs)

• Burning sensation during urination
• Frequent urination or pain
• Recurrent urinary infections without a clear cause

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5. Increase in cyst size or expansion

• Gradual enlargement of the cyst
• Pressure or pain in the lower abdomen
• Higher risk of infection or rupture

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6. Chronic lower abdominal pain

• Persistent or recurring pain
• Worsens with movement or during infection
• Affects daily quality of life

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7. Rare complications (serious cellular changes)

In cases that are neglected for a very long time:

• Abnormal changes in cyst cells may occur
• Therefore, surgical removal of the urachus is often recommended when symptoms are recurrent or persistent

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Treatment of urachal remnant (medical management)

A urachal remnant is a leftover fetal canal that connected the bladder to the umbilicus during pregnancy. Normally it closes after birth, but in some cases parts remain, leading to infection, pain, or cyst formation.

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1. When is medical treatment used?

Medication is used in specific cases such as:

• Mild to moderate infection
• Purulent discharge from the umbilicus
• Lower abdominal pain with mild fever
• Early-stage cyst formation without severe complications

In cases of large cysts, abscess formation, or recurrent infections, surgery is usually the preferred option.

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2. Medical treatment options

1. Antibiotics

Antibiotics are the main treatment because they target bacterial infection.

• Selected based on skin and urinary bacteria
• May include penicillin or cephalosporins depending on the case

Goals:

• Eliminate infection
• Reduce inflammation
• Prevent abscess formation

The exact type and dosage must be prescribed by a physician.

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2. Painkillers and anti-inflammatory drugs

Used to relieve symptoms such as:

• Lower abdominal pain
• Inflammation
• Mild fever

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3. Topical antiseptics (if discharge is present)

• Cleaning the umbilical area
• Using mild antiseptic solutions
• Keeping the area clean and dry

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4. Supportive care

• Drinking plenty of fluids
• Rest
• Avoiding pressure on the abdominal area

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3. When is medical treatment not enough?

Medication alone is not sufficient in cases such as:

• Recurrent infections
• Presence of a visible cyst on imaging
• Abscess formation
• Persistent discharge despite treatment

In these cases, surgical removal is usually recommended to prevent recurrence.

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4. Important note

• Antibiotics improve symptoms temporarily but do not remove the urachal remnant
• Delayed treatment may lead to recurrent infections or abscess formation
• Accurate diagnosis is done using ultrasound or CT scan

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Surgical treatment of urachal remnant

When medication is not effective, or when there are recurrent infections, cysts, or abscess formation, surgery becomes the definitive treatment.

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1. Goal of surgery

The main goals are:

• Complete removal of the urachal remnant
• Removal of infected tissue or cysts
• Prevention of recurrence
• Reducing complications such as abscess formation or chronic infection

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2. Types of surgical treatment

1. Open surgery

This is the traditional method.

Procedure:

• A small incision is made in the lower abdomen
• The cyst or urachal tract is completely removed
• In some cases, part of the bladder dome may also be removed

Advantages:

• Suitable for large or complex cases
• Widely available

Disadvantages:

• Larger scar
• More postoperative pain
• Longer recovery time

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2. Laparoscopic surgery

This is the most commonly used modern technique.

Procedure:

• Small incisions in the abdomen
• A camera and fine instruments are inserted
• The urachal remnant is removed internally without large cuts

Advantages:

• Less postoperative pain
• Minimal scarring
• Faster recovery
• Quick return to daily activities

Disadvantages:

• Requires specialized surgical expertise
• May not be suitable for very complex cases

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3. Robotic surgery

A highly advanced surgical technique.

Procedure:

• Similar to laparoscopy but performed using robotic assistance controlled by the surgeon

Advantages:

• Extremely high precision
• Reduced risk of complications
• Less blood loss

Disadvantages:

• High cost
• Not available in all hospitals

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4. Partial cystectomy (with bladder removal segment)

Used in advanced cases.

Indications:

• Direct connection between urachus and bladder
• Deep infection involving bladder tissue

Procedure:

• Complete removal of the urachal tract along with a small portion of the bladder dome
• Careful surgical repair of the bladder

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3. Recovery after surgery

After surgery, the patient may experience:

• Urinary catheter for 2–5 days (especially if bladder is involved)
• Pain relief medications
• Antibiotics to prevent infection
• Regular wound or incision care

Recovery time:

• 1–3 weeks for laparoscopic surgery
• Longer for open surgery

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4. How doctors choose the surgical method

The choice depends on:

• Size of the cyst or severity of infection
• Presence of abscess
• Involvement of the bladder
• Overall patient health
• Surgeon experience and available facilities

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Tips for managing urachal remnant (before or during inflammation)

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1. Maintain good hygiene

• Clean the umbilical area gently every day
• Keep it dry after washing
• Avoid harsh chemicals or excessive rubbing

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2. Do not ignore discharge

• Any discharge or pus requires medical attention
• Do not squeeze or press the area
• This may worsen infection or spread bacteria

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3. Use medications under medical supervision

• Do not take antibiotics without a prescription
• Proper diagnosis is needed before treatment

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4. Monitor symptoms regularly

Seek medical help if the following occur:

• Persistent lower abdominal pain
• Fever
• Swelling around the navel