A Rare Cause of Drug-Resistant Epilepsy and Nonconvulsive Status Epilepticus: Ring Chromosome 20

Ring chromosome 20 presents as a drug-resistant epilepsy syndrome with complex partial seizures and nonconvulsive status epilepticus. Other characteristics are mild to moderate learning disability, and various dysmorphic features. Its diagnosis necessitates a high index of suspicion since the incidence is rare and there is no a specific phenotypic expression.