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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Pediatrics · Lymphatic Malformation

Living with a Lymphatic Malformation: Monitoring and Red Flags

At a Glance

Lymphatic malformations require watchful waiting to track changes over time. Infections and minor trauma can trigger rapid swelling, known as a flare-up. Seek emergency care immediately if swelling causes noisy breathing, difficulty swallowing, or vision changes.

Living with a lymphatic malformation (LM) often means entering a phase of watchful waiting. While many children have a very positive long-term outlook, the “fluid-filled” nature of these malformations means they can change over time [1][2]. Understanding how to monitor your child and recognizing the signs of a “flare-up” can help you feel more in control of the situation.

Triggers for Sudden Swelling

Because an LM is part of the lymphatic system, it is sensitive to what is happening in the rest of the body. Two common triggers can cause an LM to swell rapidly (a “flare-up”):

  1. Infection: Even a simple cold, the flu, or an ear infection can cause the lymphatic system to react [3][4]. As the body fights the infection, the fluid in the malformation may increase, making it look larger, firmer, or redder [5].
  2. Trauma or Bleeding: A bump or bruise to the area can cause intralesional hemorrhage (bleeding inside the cysts) [3][6]. This usually causes the area to swell quickly and may cause it to look bluish or dark under the skin [7].

The Red Flag List

While most flare-ups can be managed with rest and monitoring, some symptoms require immediate medical attention.

Seek emergency care if your child experiences:

  • Breathing Changes: Any noisy breathing (stridor), gasping, or visible “pulling” of the skin around the ribs or neck [8][9].
  • Swallowing Difficulty: Sudden drooling, refusing to eat, or gagging during meals [10].
  • Rapid, Painful Expansion: If the malformation becomes very tight, hot, or extremely painful to the touch [3].
  • Vision Issues: If a malformation near the eye causes the eyelid to droop or the eye to appear pushed forward [11].

Routine Monitoring and Surveillance

For many families, monitoring is a marathon, not a sprint.

  • Surveillance Imaging: Your doctor may recommend a routine MRI or ultrasound every 6 to 12 months, or during major growth spurts, to ensure the LM is not growing faster than the child [12][13].
  • Scan Anxiety: It is important to know that for young children, getting a clear MRI often requires general anesthesia or heavy sedation [14]. This reality often adds significant stress and “scan anxiety” for parents, but MRI remains the preferred imaging tool because it does not expose the child to radiation [14][15].
  • Quality of Life: Many centers now use patient-reported outcome measures to ensure they are treating the “whole child,” not just the malformation [15][16].

The Psychological Toll

Living with the unpredictability of a chronic condition is a significant weight for parents. It is okay to feel overwhelmed. Connecting with a multidisciplinary team that includes a social worker or psychologist can provide your family with tools to manage the stress of chronic monitoring [17][18]. Remember, the goal of treatment is not just to manage a physical mass, but to ensure your child lives a full, active life [19].

For guidance on assembling the right specialists, read Building Your Care Team.

Common questions in this guide

What causes a lymphatic malformation to suddenly swell?
A flare-up is commonly triggered by a viral or bacterial infection, such as a cold or ear infection, which causes the lymphatic system to react. It can also be caused by minor physical trauma or a bump, leading to bleeding inside the malformation's cysts.
When should I seek emergency care for a lymphatic malformation flare-up?
You should seek immediate medical attention if you notice any noisy breathing, gasping, or visible pulling around the ribs. Other red flags include sudden difficulty swallowing, rapid and painful expansion of the mass, or vision issues like a drooping eyelid.
How often does a child need an MRI to monitor a lymphatic malformation?
Doctors generally recommend routine surveillance imaging, like an MRI or ultrasound, every 6 to 12 months. Additional scans may also be needed during major growth spurts to ensure the malformation is not growing faster than the child.
Should I take photos of the lymphatic malformation?
It is helpful to take baseline photos of the malformation when it looks normal. This provides a clear comparison for your care team to evaluate how much it has changed or swelled during a potential flare-up.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is the specific emergency protocol if my child's malformation swells suddenly?
  2. 2.Should my child receive antibiotics before dental work or minor surgeries to prevent a flare-up?
  3. 3.How often do you recommend a 'baseline' MRI, and what would trigger the need for a new scan?
  4. 4.Are there certain sports or physical activities my child should avoid to prevent injury-related bleeding?
  5. 5.Who is our point of contact on the vascular anomalies team for non-emergency questions versus urgent flare-ups?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
  1. 1

    An 8-year population description from a national treatment centre on lymphatic malformations.

    Eliasson JJ, Weiss I, Høgevold HE, et al.

    Journal of plastic surgery and hand surgery 2017; (51(4)):280-285 doi:10.1080/2000656X.2016.1254092.

    PMID: 27846771
  2. 2

    Sudden Appearance of a Palpable Chest Wall Mass Secondary to Macrocystic Lymphatic Malformation: A Case Report.

    Alkwai H, Alkwai H, Al Namshan M

    Children (Basel, Switzerland) 2023; (10(2)) doi:10.3390/children10020235.

    PMID: 36832364
  3. 3

    Emergent sclerotherapy of a newborn with expanding lymphatic malformation causing respiratory distress.

    Sheehan CC, Idicula W, Raabe A, et al.

    Radiology case reports 2017; (12(2)):409-412 doi:10.1016/j.radcr.2017.01.003.

    PMID: 28491199
  4. 4

    Spontaneous resolution of a recurrent axillary cystic hygroma following acute infection.

    Gan RW, Chauhan K, Singh S

    BMJ case reports 2015; (2015()).

    PMID: 26552879
  5. 5

    A Case of Lymphangiomatosis With Infected Lymphangiomas Effectively Treated by Thoracoscopic Debridement and Drainage.

    Minakata T, Suzuki T, Kamio Y, et al.

    Chest 2020; (158(5)):e221-e224 doi:10.1016/j.chest.2020.06.048.

    PMID: 33160540
  6. 6

    A rare case of orbital lymphangioma with persistent fetal vasculature and extraorbital vascular malformations treated with intralesional bleomycin.

    Hada M, Upadhyay A, Khilnani K, Shekhawat N

    Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus 2018; (22(6)):471-473.e1 doi:10.1016/j.jaapos.2018.04.010.

    PMID: 30120984
  7. 7

    Ultrasonic findings of fetal axillary lymphangioma with intralesional hemorrhage.

    Furue A, Mochizuki J, Onishi Y, et al.

    Journal of medical ultrasonics (2001) 2016; (43(2)):285-9 doi:10.1007/s10396-015-0695-4.

    PMID: 26707998
  8. 8

    Anesthetic Management of a Massive Cystic Hygroma of the Neck in a Neonate.

    Puri S, Jafra A, Dogra N, et al.

    Journal of Indian Association of Pediatric Surgeons 2024; (29(2)):183-185 doi:10.4103/jiaps.jiaps_197_23.

    PMID: 38616834
  9. 9

    Airway obstruction caused by rapid enlargement of cervical lymphangioma in a five-month-old boy.

    Shimizu J, Taga T, Kishimoto T, et al.

    Clinical case reports 2016; (4(9)):896-8 doi:10.1002/ccr3.659.

    PMID: 27648270
  10. 10

    Lymphatic malformations: a 20-year single institution experience.

    Kronfli AP, McLaughlin CJ, Moroco AE, Grant CN

    Pediatric surgery international 2021; (37(6)):783-790 doi:10.1007/s00383-021-04859-5.

    PMID: 33586010
  11. 11

    A toddler with acute, life-threatening airway obstruction due to a retropharyngeal macrocytic lymphatic malformation: successful emergency sclerotherapy.

    Cherkes M, Pondorfer-Schaefer P, Pock J, et al.

    International journal of pediatric otorhinolaryngology 2025; (195()):112433 doi:10.1016/j.ijporl.2025.112433.

    PMID: 40580782
  12. 12

    Long-Term Imaging Follow-Up in DIPNECH: Multicenter Experience.

    Chung C, Bommart S, Marchand-Adam S, et al.

    Journal of clinical medicine 2021; (10(13)) doi:10.3390/jcm10132950.

    PMID: 34209147
  13. 13

    Role of follow-up imaging after resection of brain arteriovenous malformations in pediatric patients: a systematic review of the literature.

    Jimenez JE, Gersey ZC, Wagner J, et al.

    Journal of neurosurgery. Pediatrics 2017; (19(2)):149-156 doi:10.3171/2016.9.PEDS16235.

    PMID: 27911246
  14. 14

    [Cystic fibrosis and computed tomography of the lungs].

    Bischoff A, Weinheimer O, Eichinger M, et al.

    Der Radiologe 2020; (60(9)):791-801 doi:10.1007/s00117-020-00713-2.

    PMID: 32621155
  15. 15

    Development and Preliminary Validation of the Patient-Reported Outcome Measure for Vascular Malformation Questionnaire: A Prospective Cohort Study.

    England RW, Motaghi M, Kohler B, et al.

    Journal of vascular and interventional radiology : JVIR 2021; (32(5)):683-690.e4 doi:10.1016/j.jvir.2021.01.263.

    PMID: 33678569
  16. 16

    Outcome measurement instruments for peripheral vascular malformations and an assessment of the measurement properties: a systematic review.

    Horbach SER, Rongen APM, Elbers RG, et al.

    Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation 2020; (29(1)):1-17 doi:10.1007/s11136-019-02301-x.

    PMID: 31549367
  17. 17

    The Role of Interventional Radiologists in the Treatment of Congenital Lymphatic Malformations.

    Cronan J, Gill AE, Shah JH, Hawkins CM

    Seminars in interventional radiology 2020; (37(3)):285-294 doi:10.1055/s-0040-1713446.

    PMID: 32773954
  18. 18

    Management of Complex Arteriovenous Malformations Using a Novel Combination Therapeutic Algorithm.

    Chelliah MP, Do HM, Zinn Z, et al.

    JAMA dermatology 2018; (154(11)):1316-1319 doi:10.1001/jamadermatol.2018.3039.

    PMID: 30326494
  19. 19

    Magnitude and relevance of change in health-related quality of life in patients with vascular malformations treated with sirolimus.

    Harbers VEM, Bouwman FCM, van Rijnsoever IMP, et al.

    Frontiers in medicine 2023; (10()):1155476 doi:10.3389/fmed.2023.1155476.

    PMID: 37153086

This page provides educational information on monitoring lymphatic malformations and identifying flare-ups. It does not replace professional medical advice. Always contact emergency services or your doctor immediately if you notice sudden swelling or breathing changes.

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