Abstract
A 49-year-old patient with a history of lymphoproliferation and autoimmune cytopenias presented with unexplained longitudinal extensive transverse myelitis. Flow cytometry on peripheral blood showed an elevated level of double negative T lymphocytes, a finding typical for autoimmune lymphoproliferative syndrome (ALPS). Inborn error of immunity (IEI) gene panel demonstrated a heterozygous variant in the FAS gene (c.857G > A, p.(Gly286Glu)), formally confirming the diagnosis. Autoimmune neurological conditions in a context of predisposition for infection and lymphoproliferation should raise suspicion of IEI. Specific testing for ALPS should be considered in patients with a history of non-malignant lymphoproliferation, multilineage cytopenias and unexplained autoimmune (neurological) manifestations.
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