Lymphangioma: Understanding Lymphatic Malformations in Children

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

TL;DR

A lymphangioma, or lymphatic malformation, is a noncancerous, fluid-filled cyst that typically appears under a child's skin between birth and age two. These cysts form when lymph fluid backs up due to improperly developed vessels, most commonly on the head or neck. While most cases are harmless and require no treatment, large malformations can impact vital organs. Management ranges from monitoring to specialized procedures like sclerotherapy or surgical removal.

Quick Answer

A lymphangioma is a benign, fluid-filled cyst caused by a developmental blockage in the lymphatic system, primarily affecting infants and toddlers. These malformations are categorized as macrocystic, microcystic, or mixed based on their size and depth. While most are painless and resolve without intervention, treatment is necessary if the cyst obstructs breathing or swallowing. Common therapies include sclerotherapy and surgical excision, though recurrence is a significant factor in clinical management.

What Is a Lymphangioma?

A lymphangioma, frequently referred to by healthcare providers as a lymphatic malformation, is a rare, noncancerous growth that develops beneath the skin. These fluid-filled cysts are the result of an overgrowth or blockage within the lymphatic vessels, which are responsible for transporting lymph fluid throughout the body. When this fluid cannot flow normally, it collects and forms a visible bump or mass.

Most lymphangiomas are detected at birth or within the first two years of life. While they can develop anywhere on the body, they are most frequently found on the head and neck. These malformations vary significantly in size, ranging from tiny, pimple-like bumps to large, soft masses that can occasionally interfere with nearby vital organs.

Types of Lymphatic Malformations

Healthcare providers classify these malformations into three distinct categories based on their clinical presentation and the size of the individual cysts. Understanding the type is crucial for determining the appropriate management strategy and assessing potential associations with other health conditions.

Macrocystic malformations, also known as cystic hygromas, are larger masses often located deep within the neck, chest, or armpits. In contrast, microcystic malformations are smaller and appear closer to the skin's surface. A mixed malformation contains elements of both types, presenting a more complex clinical picture.

Malformation Type	Clinical Characteristics	Common Locations
Macrocystic (Cystic Hygroma)	Large, soft masses; deep-seated; may be reddish-blue.	Neck, face, armpits, chest.
Microcystic	Smaller, pimple-sized cysts; surface-level.	Arms, legs, mouth, chest.
Mixed	A combination of macrocystic and microcystic features.	Varies by individual case.
Associated Conditions	Linked to Down, Noonan, and Turner syndromes.	Primarily macrocystic types.

Symptoms and Functional Impact

While lymphangiomas are typically painless and not itchy, their impact is largely determined by their size and anatomical location. Most children with these malformations do not experience significant health problems. However, when a cyst puts pressure on a vital organ, it can lead to functional issues that require medical attention.

For instance, malformations in the neck or mouth can lead to difficulties with feeding, speaking, or breathing. In rare cases, a large macrocystic malformation can obstruct a newborn's airway at birth. If the condition affects the bones or soft tissues extensively, it is referred to as lymphangiomatosis, which may lead to bone overgrowth or loss.

Diagnosis and Modern Management

The diagnostic process often begins with a prenatal ultrasound, where larger malformations can sometimes be detected before birth. After delivery, a physical exam and a review of the child's medical history are performed. Advanced imaging techniques, such as MRI or CT scans, are utilized to map the extent of the growth and its relationship to surrounding structures.

Management strategies follow a "watch and wait" approach for most asymptomatic cases, as many cysts do not progress or may resolve on their own. If treatment is necessary due to functional impairment, several options are available. Sclerotherapy, which involves injecting a solution to shrink the cyst, is a common choice. While surgical removal is possible, it carries a recurrence rate of over 30% because these malformations often start deep beneath the skin.

Treatment Option	Method of Action	Clinical Note
Watch and Wait	Regular monitoring without active intervention.	Best for small, asymptomatic cysts.
Sclerotherapy	Injection of a scarring agent to shrink the cyst.	Often preferred over surgery.
Surgical Excision	Physical removal of the malformation.	High recurrence risk (>30%).
Laser/Cryotherapy	Using heat or extreme cold to destroy tissue.	Effective for surface malformations.
Medication	Use of sirolimus or other targeted therapies.	Used for complex or recurrent cases.

Conclusion

A lymphangioma is a benign condition that, in the majority of cases, does not pose a threat to a child's long-term health. While the prospect of a fluid-filled cyst can be concerning for parents, modern diagnostic tools and varied treatment options ensure that even complex cases can be managed effectively. Close monitoring by a pediatric specialist is the most important step in ensuring the best outcome for the child.

Next Steps

If you notice a new or changing bump on your child's skin, especially on the head or neck, consult a pediatrician for a thorough evaluation. Early diagnosis and a professional management plan are essential for monitoring the growth and determining if any functional interventions are needed.

Frequently Asked Questions

What is a lymphangioma?

It is a noncancerous, fluid-filled cyst that forms when the lymphatic system doesn't develop correctly, causing fluid to collect under the skin.

Is it cancerous?

No, lymphangiomas are benign (noncancerous) growths and do not spread to other parts of the body like cancer does.

What is the difference between a lymphangioma and a cystic hygroma?

A cystic hygroma is simply a type of lymphangioma—specifically, the macrocystic type that consists of larger, deep-seated cysts.

Why do these cysts form?

They form during fetal development when a blockage or "kink" occurs in the lymph vessels, preventing fluid from flowing normally.

Can a lymphangioma be detected before birth?

Yes, larger lymphatic malformations can often be identified during routine prenatal ultrasound screenings.

Are there different types of lymphatic malformations?

Yes, they are classified as macrocystic (large), microcystic (small), or mixed, depending on the size and depth of the cysts.

Do all lymphangiomas need surgery?

No, most do not require treatment. Doctors often recommend a "watch and wait" approach unless the cyst causes functional problems.

What is sclerotherapy?

It is a procedure where a doctor injects a special solution into the cyst to cause it to scar and eventually shrink.

Why do lymphangiomas often grow back after surgery?

Recurrence occurs in over 30% of cases because these malformations often start deep in the tissue, making it difficult to remove every affected cell.

Are there medications to treat these cysts?

Yes, certain medications like sirolimus or propranolol may be used by specialists to manage more complex malformations.

What are the signs of an infected cyst?

Signs include the area feeling warm to the touch, changing color, or leaking yellow or clear pus.

Can a lymphangioma affect my child's breathing?

In rare cases, if a cyst is large and located in the neck or chest, it can put pressure on the windpipe and cause breathing issues.

Is this condition related to genetic disorders?

Some types, particularly macrocystic malformations, are associated with conditions like Down syndrome or Turner syndrome.

What is lymphangiomatosis?

This is a condition where lymphatic malformations are widespread throughout the child's bones and soft tissues.

What should I do if the cyst changes color or size?

You should contact your child's healthcare provider immediately for a re-evaluation if you notice any significant changes in the cyst.

Medical Disclaimer

The information provided in this article is for educational purposes only and should not be considered medical advice. Always seek the counsel of a qualified healthcare professional regarding any concerns about your child's health or developmental growths.