Which are the symptoms of Susacs syndrome?

Susac’s syndrome is a rare, immune-mediated endotheliopathy characterized by the classic clinical triad of encephalopathy, branch retinal artery occlusions (BRAO), and sensorineural hearing loss. Symptoms often emerge unpredictably and vary significantly in severity, requiring prompt recognition by a multidisciplinary medical team to mitigate long-term neurological and sensory damage.

What are the primary symptoms of Susac’s syndrome?

The clinical presentation of Susac’s syndrome is defined by the involvement of the brain, the eyes, and the inner ear. While not all patients present with the full triad initially, the presence of these three features is highly suggestive of the diagnosis:

• Encephalopathy: Patients often experience cognitive dysfunction, personality changes, severe headaches (often migraine-like), memory loss, and in acute cases, confusion or psychosis.


• Branch Retinal Artery Occlusions (BRAO): Patients may notice sudden vision loss, "blind spots" (scotomas), or flickering lights. These occlusions are caused by the blockage of small blood vessels in the retina.


• Sensorineural Hearing Loss: This often manifests as sudden-onset hearing loss, frequently accompanied by tinnitus (ringing in the ears) or vertigo, resulting from damage to the cochlear microvasculature.

What are the early warning signs to watch for?

Early identification of Susac’s syndrome is critical. Families should watch for "red flag" symptoms such as a sudden change in personality or cognitive sharpness, unexplained persistent headaches, or any sudden alteration in vision or hearing. Because Susac’s syndrome is an inflammatory process affecting the smallest blood vessels, these symptoms can appear abruptly and fluctuate in intensity. If a patient experiences a sudden "drop attack" (a sudden fall without loss of consciousness) or unexplained confusion, they should be evaluated immediately by a neurologist.

How does the severity and progression of symptoms vary?

The course of Susac’s syndrome is highly variable. Some patients experience a monophasic course—meaning a single episode that resolves over months—while others experience a polyphasic or chronic, relapsing course that requires long-term immunosuppressive therapy. At DiseaseMaps.org, we have seen that the 20 community members affected by Susac’s syndrome often report that the most debilitating symptoms impacting daily quality of life are the cognitive "fog" and the persistent fatigue associated with the inflammatory nature of the disease. While vision and hearing loss can be permanent, early and aggressive treatment with corticosteroids, intravenous immunoglobulin (IVIG), or other immunosuppressants can significantly alter the disease trajectory.

When should I seek immediate medical attention?

Immediate medical attention is required if there is any evidence of acute neurological deterioration. This includes sudden weakness, slurred speech, acute confusion, or a rapid decline in vision or hearing. Given that Susac’s syndrome is a rare disease, patients often benefit from being seen in a tertiary care center where neurologists, ophthalmologists, and otolaryngologists can coordinate care effectively.

Next steps

• Consult a neurologist or neuro-ophthalmologist with experience in rare vasculitic or autoimmune conditions.


• Request a brain MRI (specifically looking for "snowball" lesions in the corpus callosum) and a fluorescein angiography to investigate retinal artery involvement.


• Connect with the Susac’s syndrome community at DiseaseMaps.org to share experiences and coping strategies with others navigating this rare diagnosis.


• Maintain a symptom diary to track the frequency and severity of headaches, hearing changes, and cognitive fluctuations for your clinical team.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Susac syndrome overview.


• Orphanet: Rare disease database entry for Susac syndrome (ORPHA:3240).


• OMIM (Online Mendelian Inheritance in Man): Clinical summary for Susac syndrome.


• American Academy of Ophthalmology: Clinical guidelines on Branch Retinal Artery Occlusion.