# A Rare Adolescent Presentation of Morvan Syndrome: Diagnostic Challenges and Therapeutic Response

## TL;DR

A 17-year-old with Morvan syndrome showed unusual symptoms and improved with early immunotherapy.

## Contribution

Highlights atypical adolescent presentation and effective treatment of Morvan syndrome without thymoma.

## Key findings

- Severe back pain, muscle twitching, hallucinations, and hyponatremia occurred in a 17-year-old.
- Symptoms improved with corticosteroids and plasmapheresis.
- No thymoma or malignancy was present, unlike typical adult cases.

## Abstract

Morvan syndrome is a rare autoimmune disorder that predominantly affects adults, but it can also present in adolescents with atypical symptoms. This case of a 17‐year‐old patient exhibited severe back pain, muscle twitching, visual hallucinations, and hyponatremia, without the thymoma or malignancy commonly observed in adult cases. Early diagnosis and prompt immunotherapy with corticosteroids and plasmapheresis resulted in significant symptom improvement, highlighting the importance of timely intervention in complex neuroimmunological disorders.