P344 A rare association: acute disseminated encephalomyelitis in child affect by autoimmune haemolytic anaemia and autoimmune thrombocytopenia

Acute disseminated encephalomyelitis (ADEM) is an inflammatory demyelinating illness, characterize-ed by a monophasic course frequently associated with infections or previous immunization. Regarding pathogenesis, encephalomyelitis is associated with some immunological mechanisms. Post-infection or post-vaccination inflammatory reactions in the perivenular region in the central nervous system (CNS) may be explained by a molecular mimicry mechanism. An antecedent infection was identified in 72–77% of paediatric patients. We present a case of a 5 year-old girl in follow up for autoimmune thrombocytopenia (AT) and autoimmune haemolytic anaemia (AHA) in steroid treatment, with history of left hemiparesis, language delay, from as a consequence of perinatal suffering, who has developed ADEM. This patient presented with progressive weakness of limbs, neck pain associated with fever from one day. It was acute in onset and gradually progressive. She became quickly hypotonic and hyporesponsive and had reduced level of consciousness. Within 12 hours of admission, the patient developed sphincter incontinence and dysphagia. After exclusion of papilloedema, lumbar puncture has been performed. An urgent MRI was performed, which showed multiple subcortical lesions of varying size showing hyperintensities in TR at the bridge and in T2 at the medulla . Cerebrospinal fluid (CSF) study showed cell count of 40 cells/mm3 , protein 58 mg/dL, glucose 54 mg/dL. No oligoclonal bands were present in CSF. Blood and CSF cultures were negative like other infectiological analyzes. Also CSF-PCR for the presence of bacteria and virus was negative. Her autoimmune profile with antinuclear antibody was also negative. The clinical features and the MRI findings were suggestive of ADEM. Partial quadriplegia, and reduction of reflexes, as seen in the myelitic form of ADEM, were present. She had developed ADEM while on the maintenance dose of prednisolone. After diagnosis, intravenous methylprednisolone was given at 30 mg/kg daily for 5 days. After 48 hours there was a significant improvement in the patient‘s clinical condition. A regimen of oral steroid was advised after intravenous therapy . The patient responded well to steroid therapy. No residual lesion was found on follow-up. AT and AHA are relatively uncommone. There are studies postulating the possibility of a combination of several autoimmune diseases. Very few cases have been found with this rare association in the literature. Follow-up of these patients is essential for detecting the development of other autoimmune disease in such cases.