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Anti-contactin-associated protein 1 antibody-positive nodopathy presenting with central nervous system symptoms
Yasuko Mori1, Nobuaki Yoshikura1, Yuki Fukami2
1Department of Neurology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, Gifu 501-1194, Japan.
Abstract:
Contactin-associated protein 1 (Caspr1) is widespread in both the peripheral and central nervous systems (CNS). However, anti-Caspr1 antibody-positive nodopathy associated with CNS symptoms has not previously been reported. In this case, a 69-year-old man presented with polyneuropathy and memory loss. The patient had negative myoclonus, positive myoclonus, and pseudoathetosis in the upper limbs, and we detected anti-Caspr1 antibodies in the serum and cerebrospinal fluid. Therefore, anti-Caspr1 nodopathy was diagnosed. After rituximab treatment, all symptoms of polyneuropathy, involuntary movements, and memory impairment improved. In conclusion, anti-Caspr1 antibodies might also affect the CNS; therefore, CNS symptoms of anti-Caspr1 nodopathy require attention.
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