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PubMed This is a summary of 24 peer-reviewed journal articles Updated
Hematology · Blue Rubber Bleb Nevus Syndrome

Living with BRBNS: Monitoring and Daily Life

At a Glance

Living with Blue Rubber Bleb Nevus Syndrome (BRBNS) requires coordinating a multidisciplinary care team and closely monitoring for signs of internal bleeding. If taking Sirolimus, regular blood tests are essential to check drug levels and manage side effects.

Living with Blue Rubber Bleb Nevus Syndrome (BRBNS) is a long-term journey that requires a balance of medical vigilance and maintaining your quality of life. Because this syndrome can affect multiple systems—the skin, the gut, and sometimes the bones or nervous system—your care cannot be managed by a single doctor [1][2].

Your Multidisciplinary Care Team

Successful long-term management relies on a multidisciplinary approach. This means a group of specialists who coordinate your care:

  • Hematology: Often the “lead” on medical therapies like Sirolimus and managing anemia [3][4].
  • Gastroenterology: Monitors and treats any internal bleeding in the stomach or intestines [5][6].
  • Dermatology: Evaluates and monitors the appearance and growth of skin lesions [7][8].
  • Genetics: Confirms the diagnosis and provides information about the TEK mutation [9][10].

Finding Your “Quarterback”: With so many specialists, it is important to explicitly ask which doctor will act as the primary coordinator (or “quarterback”) of your care to ensure all team members are communicating effectively [1].

Monitoring on Sirolimus

If you are taking Sirolimus (an mTOR inhibitor), regular monitoring is essential to ensure the medication is working effectively without causing harm [11][12].

Trough Levels and Blood Work
Doctors measure “trough levels”—the lowest concentration of the drug in your blood—usually just before your next dose [11]. Unlike some other conditions that require high doses, the target trough levels for vascular anomalies like BRBNS are generally kept low (e.g., 2 to 6 ng/mL) [13][12]. This lower target is highly effective for reducing lesions while minimizing severe toxicity or immune suppression [13].

You will also need frequent labs to monitor:

  • Complete Blood Count (CBC): To check for neutropenia (low white blood cells) or anemia [14][15].
  • Lipid Panel: To monitor for hyperlipidemia (high cholesterol or triglycerides), which can be a side effect of mTOR inhibitors [16].
  • Liver Function: To ensure your body is processing the medication safely [17].

Managing Side Effects
The most common side effect is mucositis (painful mouth sores) [18][19]. Using a soft toothbrush and avoiding spicy or acidic foods can help. If sores become severe, your doctor may adjust your dose or provide medicated mouthwashes [13].

At-Home Vigilance

Between doctor visits, you are the best person to notice small changes that could indicate internal bleeding.

  • Energy Levels: A sudden or slow decline in energy (feeling “winded” or unusually tired) is often the first sign of iron-deficiency anemia caused by hidden bleeding [20][21].
  • Stool Color: Watch for melena—stools that are dark, sticky, and look like tar. This is a sign of blood in the upper digestive tract [22][23].
  • New Symptoms: Report any new, severe back pain, chronic headaches, or limb weakness to your team, as these can occasionally signal lesions in the nervous system [7][24].

Navigating the Psychological Impact

Living with a rare disease like BRBNS can be emotionally taxing. Many patients experience “scan anxiety”—the stress and fear that build up before a follow-up MRI or endoscopy. It is also common to feel self-conscious about visible skin lesions or frustrated by the “invisibility” of internal symptoms [1].

Connecting with rare disease advocacy groups or a specialized counselor can provide a safe space to discuss these feelings. Remember that you are more than your diagnosis; maintaining your mental well-being is just as important as managing your physical health.

Common questions in this guide

What specialists should be on my BRBNS care team?
Your care team should typically include a hematologist, gastroenterologist, dermatologist, and geneticist. It is important to ask one of these specialists to act as the primary coordinator to ensure everyone is communicating effectively.
Why do I need to check Sirolimus trough levels?
A trough level measures the lowest concentration of the drug in your blood, usually checked right before your next dose. For BRBNS, doctors aim for a low target range (often 2 to 6 ng/mL) to effectively treat lesions while minimizing side effects.
How can I tell if I have internal bleeding from BRBNS?
Signs of hidden internal bleeding include a sudden or gradual drop in energy, feeling unusually winded, or having dark, sticky, tar-like stools (melena). Contact your medical team right away if you notice these changes.
How do I manage mouth sores from taking Sirolimus?
Mouth sores, also called mucositis, are a common side effect of Sirolimus. You can manage them by using a soft toothbrush and avoiding spicy or acidic foods. If they become severe, your doctor may prescribe medicated mouthwashes or adjust your dose.
What is scan anxiety and how can I deal with it?
Scan anxiety is the common stress and worry that builds up before medical imaging or procedures like endoscopies. Speaking with a specialized counselor or connecting with rare disease advocacy groups can provide helpful coping strategies.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is my specific target Sirolimus trough level, and how often will we test it?
  2. 2.How frequently should we monitor my cholesterol, triglycerides, and white blood cell counts?
  3. 3.Who is the 'lead' coordinator for my multidisciplinary team who ensures my various specialists are communicating?
  4. 4.Can you recommend a mental health professional who has experience with patients living with rare, chronic conditions?

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 (24)
  1. 1

    Diagnosis and management of children with Blue Rubber Bleb Nevus Syndrome: A multi-center case series.

    Isoldi S, Belsha D, Yeop I, et al.

    Digestive and liver disease : official journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver 2019; (51(11)):1537-1546 doi:10.1016/j.dld.2019.04.020.

    PMID: 31358484
  2. 2

    Endoscopic mucosal resection by double-balloon enteroscopy can be an alternative in small bowel venous malformations.

    Rubio-Mateos JM, Tojo-González R, Pérez-Cuadrado-Robles E

    Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2018; (30(6)):789 doi:10.1111/den.13224.

    PMID: 29947439
  3. 3

    Case Report: Combination of sirolimus and endoscopic lauromacrogol sclerotherapy in the management of blue rubber bleb nevus syndrome with gastric tract bleeding.

    Liu L, Wang L, Hu F

    Frontiers in pediatrics 2024; (12()):1488466 doi:10.3389/fped.2024.1488466.

    PMID: 39867693
  4. 4

    A Case of Multifocal Venous Malformation With Two Somatic Pathogenic Variants in the TEK Gene.

    Ochiai S, Ono H, Shimizu A, et al.

    The Journal of dermatology 2026; (53(2)):314-317 doi:10.1111/1346-8138.70078.

    PMID: 41327934
  5. 5

    Blue rubber bleb nevus syndrome: a single-center case series in 12 years.

    Xia H, Wu J, Huang Y

    Translational pediatrics 2021; (10(11)):2960-2971 doi:10.21037/tp-21-238.

    PMID: 34976762
  6. 6

    Endoscopic Band Ligation in Blue Rubber Bleb Nevus Syndrome: A Report of Two Children.

    Samanta A, Poddar U, Sarma MS, et al.

    JPGN reports 2023; (4(4)):e344 doi:10.1097/PG9.0000000000000344.

    PMID: 38034424
  7. 7

    Blue rubber bleb nevus syndrome: Presentation of a case and review of the literature.

    Lasso Andrade FA, Cadena Arteaga JA, Echeverry Morillo VL, et al.

    Radiology case reports 2021; (16(8)):2003-2006 doi:10.1016/j.radcr.2021.04.086.

    PMID: 34158881
  8. 8

    Fern-shaped patch as a hallmark of blue rubber bleb nevus syndrome in neonatal venous malformations.

    Ivars M, Martin-Santiago A, Baselga E, et al.

    European journal of pediatrics 2018; (177(9)):1395-1398 doi:10.1007/s00431-018-3126-x.

    PMID: 29520504
  9. 9

    Blue rubber bleb nevus syndrome: A European multicenter cohort study.

    Becq A, Bisdorff A, Riccioni ME, et al.

    Digestive and liver disease : official journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver 2025; (57(2)):603-608 doi:10.1016/j.dld.2024.10.001.

    PMID: 39426903
  10. 10

    Blue Nodules in a 2-Year-Old Female With Chronic Severe Anemia.

    Ross KR, Throckmorton SK, Haley KM, et al.

    International journal of dermatology 2026; (65(4)):703-705 doi:10.1111/ijd.70202.

    PMID: 41369117
  11. 11

    Application of sirolimus in an infant presenting with a life-threatening lymphatic malformation of the head and neck: a case report.

    Yu S, Guo X

    Frontiers in pediatrics 2025; (13()):1587330 doi:10.3389/fped.2025.1587330.

    PMID: 40342900
  12. 12

    Clinical differences in sirolimus treatment with low target levels between children and adults with vascular malformations - A nationwide trial.

    Harbers VEM, Zwerink LGJM, Rongen GA, et al.

    Clinical and translational science 2023; (16(5)):781-796 doi:10.1111/cts.13488.

    PMID: 36824030
  13. 13

    Efficacy and safety of high-vs low-dose sirolimus in patients with kaposiform hemangioendothelioma: A randomized clinical trial.

    Zhou J, Lan Y, Qiu T, et al.

    Journal of the American Academy of Dermatology 2025; (93(1)):124-131 doi:10.1016/j.jaad.2025.03.023.

    PMID: 40107509
  14. 14

    A narrative review of the role of sirolimus in the treatment of congenital vascular malformations.

    Geeurickx M, Labarque V

    Journal of vascular surgery. Venous and lymphatic disorders 2021; (9(5)):1321-1333 doi:10.1016/j.jvsv.2021.03.001.

    PMID: 33737259
  15. 15

    Treatment of superficial vascular anomalies with topical sirolimus: A multicenter case series.

    Dodds M, Tollefson M, Castelo-Soccio L, et al.

    Pediatric dermatology 2020; (37(2)):272-277 doi:10.1111/pde.14104.

    PMID: 31957126
  16. 16

    Sirolimus Therapy Is Associated with Elevation in Circulating PCSK9 Levels in Cardiac Transplant Patients.

    Simha V, Qin S, Shah P, et al.

    Journal of cardiovascular translational research 2017; (10(1)):9-15 doi:10.1007/s12265-016-9719-8.

    PMID: 28028691
  17. 17

    Sirolimus for management of GI bleeding in blue rubber bleb nevus syndrome: A case series.

    Duong JT, Geddis A, Carlberg K, et al.

    Pediatric blood & cancer 2022; (69(11)):e29970 doi:10.1002/pbc.29970.

    PMID: 36094280
  18. 18

    Efficacy and Safety of Mammalian Target of Rapamycin Inhibitors in Vascular Anomalies: A Systematic Review.

    Nadal M, Giraudeau B, Tavernier E, et al.

    Acta dermato-venereologica 2016; (96(4)):448-52 doi:10.2340/00015555-2300.

    PMID: 26607948
  19. 19

    Severe adverse events during sirolimus "off-label" therapy for vascular anomalies.

    Rössler J, Baselga E, Davila V, et al.

    Pediatric blood & cancer 2021; (68(8)):e28936 doi:10.1002/pbc.28936.

    PMID: 33580918
  20. 20

    [Bean Syndrome (blue rubber bleb nevus syndrome)].

    Gawlikowska-Sroka A, Glura B, Mokrzycka M, Ociepa T

    Pomeranian journal of life sciences 2016; (62(2)):5-7.

    PMID: 29537205
  21. 21

    Anaesthetic challenges and management of a child of blue rubber bleb nevus syndrome (BRBNS) with pulmonary lesions.

    Soni L, Prasad G

    Indian journal of anaesthesia 2023; (67(2)):239-240 doi:10.4103/ija.ija_117_22.

    PMID: 37091439
  22. 22

    Intraoperative Enteroscopy: A Rare Case of Blue Rubber Bleb Nevus Syndrome and a Rare Complication of Cyanoacrylate Glue.

    Lekamalage BBW, Duncan-Were L, Llewelyn J, et al.

    Cureus 2024; (16(4)):e58655 doi:10.7759/cureus.58655.

    PMID: 38770491
  23. 23

    Clinical characteristics of blue rubber bleb nevus syndrome in adults: systematic scoping review.

    Kozai L, Nishimura Y

    Scandinavian journal of gastroenterology 2023; (58(10)):1108-1114 doi:10.1080/00365521.2023.2214263.

    PMID: 37211745
  24. 24

    Surgical considerations for spinal epidural hematoma evacuation in the setting of blue rubber bleb nevus syndrome in a child.

    Lu VM, Luiselli GA, Parker T, et al.

    Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery 2023; (39(6)):1691-1694 doi:10.1007/s00381-023-05843-1.

    PMID: 36862185

This page provides educational information about living with BRBNS and monitoring Sirolimus. It does not replace professional medical advice. Always consult your multidisciplinary healthcare team for personalized care.

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