# Alternating hemiplegia of childhood misdiagnosed as hysteria: a case report

## TL;DR

A 16-year-old girl with a rare neurological disorder was misdiagnosed for years before genetic testing confirmed alternating hemiplegia of childhood.

## Contribution

This case highlights the atypical clinical presentation of AHC and the importance of genetic testing for accurate diagnosis.

## Key findings

- The patient had a confirmed ATP1A3 gene mutation associated with AHC.
- Her symptoms differed from typical AHC presentations, including emotional and autonomic dysfunction.
- Treatment with flunarizine significantly reduced hemiplegic episodes.

## Abstract

Alternating hemiplegia of childhood (AHC) is a rare pediatric syndrome characterized by recurring episodes of hemiplegia or quadriplegia, and frequently accompanied by dystonic posturing, choreoathetosis movements, anomalous ocular motions, and a gradual deterioration in cognitive function. The principal etiology of this disorder is traced back to mutations in the ATP1A3 gene.

Here, we report a 16-year-old girl with recurrent hemiplegia since her infancy. This patient has experienced paroxysmal limb weakness and aphasia for over 15 years, and has kept seeking medical attention but without receiving effective treatment. A misdiagnosis of hysteria persisted for over 4 years until the patient’s admission to our hospital. Whole-exome sequencing identified a known pathogenic heterozygous c.2270T>C (p.Leu757Pro) mutation in her ATP1A3 gene. Notably, her clinical manifestations, including pathological emotional responses and autonomic dysfunction, differed from the established profile associated with the same ATP1A3 mutation, which typically present with intellectual disability, a rostrocaudal symptom gradient, choreoathetosis, and dysarthria. The patient was finally diagnosed with AHC and treated with flunarizine thus significantly ameliorated hemiplegic episodes.

This case enhances our understanding of the intricate clinical manifestations of AHC, which require careful differentiation from various diseases such as epilepsy, hysteria, and paroxysmal dyskinesias. In the diagnosis of patients presenting with suspected symptoms, adhering to a systematic approach for localizing and diagnosing neurological disorders is crucial to prevent misdiagnosis and inappropriate treatments. Additionally, when AHC is suspected in a patient, genetic testing should be considered as part of the diagnostic approach.