Lymphatic Malformation

A soft, fluid-filled swelling from abnormal lymph vessels

Table of Contents

Quick Facts

  • Type: Vascular (lymphatic) malformation
  • Appearance: Soft, fluid-filled swelling
  • Common sites: Head, neck, armpit
  • Treatments: Sclerotherapy, surgery, medication

Overview

A lymphatic malformation is a cluster of abnormally formed lymphatic vessels, the channels that normally carry a clear fluid called lymph through the body. When these vessels do not develop properly, lymph collects in fluid-filled spaces and forms a soft swelling. The condition is sometimes called a lymphangioma, and a large form in the neck is known as a cystic hygroma.

Lymphatic malformations are present from birth, though they may not be noticed until later. They are most common in the head and neck but can occur anywhere. They are not cancerous, but they can swell, become infected, or press on nearby structures. A range of treatments can shrink them and ease symptoms, and care is often guided by specialists in vascular anomalies.

Symptoms

Symptoms vary with size and location. Common features include:

  • A soft, doughy swelling that may be skin-colored or slightly bluish
  • Tiny clear or blood-tinged blisters on the skin surface in some cases
  • Sudden enlargement during an infection or after minor injury, sometimes from bleeding into the malformation
  • Discomfort or pressure on nearby structures

Large malformations in the neck or mouth can affect breathing, swallowing, or speech. Rapid swelling, redness, fever, or difficulty breathing needs prompt medical attention, and breathing trouble is an emergency.

Causes

Lymphatic malformations form when lymphatic vessels develop abnormally before birth. The faulty channels do not drain properly, so lymph accumulates in cyst-like spaces that can be large (macrocystic), small (microcystic), or a mix of both.

The cause is usually a chance genetic change occurring during early development, not something inherited from a parent in the usual way or caused during pregnancy. They cannot be prevented. Most occur on their own, although they are sometimes seen alongside certain genetic conditions.

Risk Factors

  • Being born with the malformation (it is congenital)
  • Certain chromosomal or genetic syndromes, in some cases
  • Infection or injury, which can make an existing malformation swell suddenly

There are no known lifestyle factors that cause lymphatic malformations.

Diagnosis

Diagnosis uses examination and imaging, and is sometimes possible before birth:

  • Physical examination: A soft, fluid-filled swelling that transmits light may suggest the diagnosis.
  • Ultrasound: Often the first test, showing fluid-filled spaces; it can also detect some malformations during pregnancy.
  • MRI: The best test for mapping the size, depth, and extent before treatment.
  • Other tests: Occasionally a sample of fluid or genetic testing in complex cases.

Treatment

Treatment depends on the size, type, and location. Options include:

  • Sclerotherapy: Injecting a medicine into the cysts to shrink them; this is often the main treatment, especially for large-cyst malformations.
  • Surgery: Removing the malformation, used for accessible lesions or when sclerotherapy is not enough.
  • Medication: Targeted drugs are sometimes used for complex or extensive malformations.
  • Antibiotics: To treat infections, which can cause sudden swelling.
  • Observation: Small, symptom-free malformations may simply be monitored.

Because these malformations can be complex and may recur, care is best provided by an experienced multidisciplinary team.

Prevention

Lymphatic malformations cannot be prevented because they form before birth. Management focuses on reducing complications:

  • Treating skin infections promptly to prevent sudden swelling
  • Following up with a vascular anomalies specialist to monitor changes
  • Reporting rapid enlargement, redness, or breathing difficulty right away
  • Caring gently for any surface blisters to lower infection risk

When to See a Doctor

See a doctor to confirm the diagnosis and plan care for a soft swelling, especially in the head or neck. Seek emergency care if a lymphatic malformation causes:

  • Difficulty breathing or noisy breathing
  • Trouble swallowing
  • Rapid swelling with redness, warmth, and fever (signs of infection)
  • Sudden enlargement after minor injury

Related Topics

Venous Malformation

A related malformation involving abnormal veins.

 Hemangioma

A vascular birthmark that grows then shrinks, unlike a malformation.

 Neck Mass

A common way a head-and-neck lymphatic malformation appears.

 Neck Swelling

Often the first noticeable sign in the neck.

Frequently Asked Questions

What is a cystic hygroma?

A cystic hygroma is a large lymphatic malformation, most often found in the neck, made up of big fluid-filled spaces. It is present from birth and can sometimes be seen on ultrasound during pregnancy. Like other lymphatic malformations, it is not cancerous but may need treatment if it grows or presses on nearby structures.

Are lymphatic malformations cancerous?

No, lymphatic malformations are not cancer. They are clusters of abnormally formed lymph vessels present from birth. They can still cause problems by swelling, becoming infected, or pressing on nearby structures, so treatment is sometimes needed.

Why does a lymphatic malformation suddenly get bigger?

Sudden enlargement often happens because of an infection or bleeding into the malformation, sometimes after a minor injury or illness. This can cause pain, redness, or pressure on nearby structures. Rapid swelling, especially with fever or breathing trouble, should be evaluated promptly.

How are lymphatic malformations treated?

Common treatments include sclerotherapy, which injects medicine to shrink the cysts, and surgery to remove accessible malformations. Targeted medications are used for some complex cases, and infections are treated with antibiotics. Small, painless malformations may simply be monitored.

Can a lymphatic malformation be detected before birth?

Yes, larger lymphatic malformations such as cystic hygromas can sometimes be seen on a prenatal ultrasound. This allows planning for care after birth. Smaller malformations may not be noticed until later in childhood.

Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition.

References

  1. National Organization for Rare Disorders (NORD). Lymphatic Malformations.
  2. MedlinePlus, U.S. National Library of Medicine. Lymphangioma.
  3. Boston Children's Hospital. Lymphatic Malformations.
  4. International Society for the Study of Vascular Anomalies (ISSVA).