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Susac

  • 1.  Susac

    Posted 06-16-2025 17:02

    Dear all,

    I have a 34 year old woman with Susac syndrome, who has had multiple BRAOs with significant field loss. She is currently on prednisone 8mg, mycophenolate, rituximab and monthly IVIG. All was quiet in December, and her most recent MRI in May showed no new lesions. She remains asymptomatic, but at her most recent visit with me last week, there was yet another new BRAO.

    Does this mean that the disease is still active despite being on maximal medical therapy?

    Do I ask her to go back up on the prednisone?

    Or do I just accept that she will continue to have recurrent BRAOs every year, which will slowly chip away at her remaining field?

    I have not had many Susac patients, and certainly none as treatment resistant as this patient. Appreciate any advice!

    Thanks,

    Lulu

     

    Lulu Bursztyn

    Comprehensive and neuro-ophthalmology

    Western University, London, Ontario

    lulu.bursztyn@sjhc.london.on.ca

    519-646-6214

     


    The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. www.sjhc.london.on.ca


  • 2.  RE: Susac

    Posted 06-16-2025 17:10

    Lulu,

    Was there leakage on the fluorescein angiogram to indicate active disease?  If so, she would need to be on more immunotherapy.  What dose of IVIG is she on?  You could potentially increase the dose or frequency and that may be the easiest/safest way to control the disease.  One of the most effective treatments is cyclophosphamide, but we usually reserve that for severe Susac syndrome, often at time of diagnosis.

    Best,

    John






  • 3.  RE: Susac

    Posted 06-16-2025 17:21
      |   view attached

    Thanks John!

    Here is her most recent IVFA, which shows staining of the affected arterial segment in the superonasal retina, that was not present on IVFA in December (the less obvious staining inferior is old).

    She has previously been on azathioprine but did not tolerate it. Treatment was initiated during pregnancy and continued during breastfeeding which somewhat limited our options. Her IVIG dose is 60g qmonthly. Would cyclophosphamide be in addition to the mycophenolate (1080mg BID) and Rituximab (1000mg q6months)?

     

     

    Lulu Bursztyn

    Comprehensive and neuro-ophthalmology

    Western University, London, Ontario

    lulu.bursztyn@sjhc.london.on.ca

    519-646-6214

     


    The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. www.sjhc.london.on.ca





  • 4.  RE: Susac

    Posted 06-16-2025 17:27
    Yes I would like to know the dosage of IVIg.  The dose could be increased to 3 g per month if not there or increased in frequency.

    Remember that staining can occur right at the site of the BRAO so I would not count that part as a definition of disease activity in your patient.  You want to look for staining elsewhere.

    Robert





  • 5.  RE: Susac

    Posted 06-16-2025 17:31
    Sorry my bad and the dose of the IVIg but you might want to try giving another 2 g/kg.  the mycophenolate can be pushed to a total dose of 3 g a day typically 1500 mg bid.  I would avoid cyclophosphamide if you can and the other therapies are not maximized yet.  Steroids can also be increased first.

    Robert





  • 6.  RE: Susac

    Posted 06-16-2025 17:52

    The FA does look like active disease rather than nonspecific leakage from prior damage based on how focal it looks. I agree with Robert that I would increase the IVIG to 2g/kg every month or increase frequency to 1g/kg every 2 weeks.  Increasing the prednisone to 10mg would also be an option in addition to the IVIG increase.  I agree with avoiding cyclophosphamide if that is the only disease activity.

    Best,

    John






  • 7.  RE: Susac

    Posted 06-16-2025 20:41
    Thanks so much John and Robert. I really appreciate the collective wisdom of this group for these rare diseases! The eyes seem to be her only ongoing activity, but as I said earlier, the area of hyperfluorescence on the IVFA is definitely new, and I am worried that she is going to slowly pick off the rest of her visual field. I will see about upping the IVIG and mycophenolate. Thanks again!
    Lulu

    Lulu Bursztyn

    Comprehensive and neuro-ophthalmology

    Western University, London, Ontario

    lulu.bursztyn@sjhc.london.on.ca

    519-646-6214

     






  • 8.  RE: Susac

    Posted 06-17-2025 01:46
    As of 2025, IVIg seems to be the best for stopping recurrent BRAOs.  Hopefully we will have something better in the future.

    R





  • 9.  RE: Susac

    Posted 06-19-2025 17:08

    Does she reconstitute early with the rituximab? Some will get B cell return sooner than the full 6 months...

     






  • 10.  RE: Susac

    Posted 06-18-2025 05:58
    I have seen a few patients like these, along with the neurologist.
    We would normally start with steroids or even first IV.
    The oral steroids would need to be tapered slowly.

    Then we try rituximab or other immunosuppression

    Immunoglobulines are the next step.

    One of my patients responded quite well to adalimumab.


    If the patients reports seeing light flashes upon tapering the steroids, then this is possibly a sign of active disease.
    The arterial wall hyperfluorescence is better visualised in the late phases of the angiogram and may apparently move more distally along the blood vessel during follow-up.

    It is not uncommon to find a normal eye fundus behind the slit lamp and yet find vasculitis on FA. To determine disease activity, I always ask for an FA.

    Michel








  • 11.  RE: Susac

    Posted 06-21-2025 19:26

    I would consider this uncontrolled Susac's. Susac's is not easy to control, and I would not consider your regimen "maximal medical therapy". Several of my patients have required cyclophosphamide to come under control.

    Best,

    Bart

     

     

    Bart K. Chwalisz, M.D.

    Neuro-ophthalmology, Headache Unit, and  Skull Base Neurology Clinic. Division of Neuroimmunology, Massachusetts General Hospital

    Skull Base Clinic: https://www.massgeneral.org/neurology/services/treatmentprograms.aspx?id=2070

    Neuro-ophthalmology, Massachusetts Eye & Ear Infirmary

     

     

     






  • 12.  RE: Susac

    Posted 06-22-2025 06:37
    I agree with Bart. Based on work from Robert Egan, Ivana Vodopivec, and Sashank Prasad, I usually use IVIg (or SCIg) as a backbone though often a second agent such as mycophenolate or rituximab is required. 

    All the best,
    Marc 

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  • 13.  RE: Susac

    Posted 06-22-2025 15:00
    Thanks for all the input! The patient has consented to an increase in prednisone, but is not interested in anything else.
    I was wrong about the dose of IVIG - it is 120g Q4 weeks, and my rheumatologist doesn't think she could get coverage for 3g/kg. So I will just repeat the IVFA in a few months and see where we land. 
    Lulu


    Lulu Bursztyn

    Comprehensive and neuro-ophthalmology

    Western University, London, Ontario

    lulu.bursztyn@sjhc.london.on.ca

    519-646-6214