Van der Knaap Disease (Vanishing White Matter) - Unusual Presentation in a Neonate: A Case Report.

Van der Knaap disease, also known as megalencephalic leukoencephalopathy with subcortical cysts (MLC), is a rare autosomal disorder, with no exact prevalence but more than 150 cases were reported in the literature. It was more prevalent in some ethnicities where consanguinity is common.[1] It is usually characterized by infantile-onset macrocephaly, cerebral leukoencephalopathy and mild neurological symptoms, and a slow course of functional deterioration.[2] Diagnosis is determined by suggestive clinical features and MRI findings that include leukodystrophy and subcortical cysts. Herein, we present a rare occurrence of Van der Knaap disease, in a 24-day-old female neonate with similar MRI findings, who presented with neonatal seizures for evaluation.