Unraveling Labrune Syndrome: A Case Report on the Neurological Phenotype in SNORD118-Negative Patients.

Labrune syndrome is a rare neurogenetic disorder with varied presentations. Here, we report the case of a 53-year-old male who presented with seizures, gait imbalance, and upper limb tremors for two years. Imaging studies revealed extensive leukodystrophy, multiple cerebral calcifications, and cystic lesions characteristic of Labrune syndrome. However, whole exome sequencing did not detect the SNORD118 mutation, typically associated with Labrune syndrome. Although the SNORD118 mutation is commonly found in Labrune syndrome, a few cases of the syndrome without this mutation have also been reported. This suggests the possibility that other yet undiscovered mutations may cause the same phenotype.