[Dermato-neuro syndrome during scleromyxedema: efficacy of plasmapheresis and intravenous immunoglobulin].

Background: Dermato-neuro syndrome is a specific neurological complication of scleromyxedema presenting with fever, coma, seizures and flu-like syndrome. To our knowledge, it has only been reported about twenty times in the literature. Its outcome is uncertain. We describe the case of a patient in whom a favorable outcome was achieved using a combination of plasmapheresis and intravenous immunoglobulin (IVIG).

Patients And Methods: A 57-year-old woman was diagnosed 14 years ago with scleromyxedema resistant to multiple lines of treatment. In November 2011, she presented an initial episode of epileptic seizure followed by post-seizure coma, and later, confusional state with visual hallucinations. She recovered spontaneously within a few days. CT scan, MRI, EEG and screening for infection were perfectly normal, resulting in suspicion of neurological involvement associated with her scleromyxedema. In December 2012 and August 2013, she presented two further episodes of status epilepticus, followed once more by a confusional state, with etiological explorations again proving unfruitful. On this occasion, her confusional state persisted for two months until the initiation of plasmapheresis and IVIG. This combination therapy led to rapid regression of all neurological symptoms and an improvement in her general condition.

Discussion: The dermato-neuro syndrome is a rare neurological complication of scleromyxedema. Its pathophysiology is unknown. The monoclonal gammopathy induced by the scleromyxedema could account for the patient's hypercoagulable state and for the formation of neutrophilic aggregates leading to impaired microcirculation. Treatment is empirical and poorly codified. The course of the disease is unpredictable and may be lethal.